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公开(公告)号:CZ132298A3
公开(公告)日:1998-09-16
申请号:CZ132298
申请日:1996-10-25
Applicant: JANSSEN PHARMACEUTICA NV
Inventor: JANSSENS FRANS EDUARD , SOMMEN FRANCOIS MARIA , SURLERAUX DOMINIQUE LOUIS NEST , LEENAERTS JOSEPH ELISABETH , VAN ROOSBROECK YVES EMIEL MARI
IPC: C07D401/04 , A61K31/00 , A61K31/495 , A61K31/496 , A61K31/4965 , A61K31/497 , A61K31/498 , A61P1/08 , A61P23/00 , A61P29/00 , A61P37/02 , A61P37/08 , A61P43/00 , C07D211/58 , C07D401/12 , C07D401/14 , C07D405/06 , C07D405/12 , C07D405/14 , C07D409/06 , C07D409/14 , C07D413/06 , C07D413/12 , C07D413/14 , C07D417/12 , C07D417/14 , C07D471/04 , C07D471/14 , A61K31/445 , A61K31/415
Abstract: This invention concerns the compounds of formulathe N-oxide forms, the pharmaceutically acceptable addition salts and the stereoisomeric forms thereof, as substance-P antagonists; their preparation, compositions containing them and their use as a medicine.
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32.
公开(公告)号:AU1308497A
公开(公告)日:1997-07-28
申请号:AU1308497
申请日:1996-12-20
Applicant: JANSSEN PHARMACEUTICA NV
Inventor: JANSSENS FRANS EDUARD , SOMMEN FRANCOIS MARIA , SURLERAUX DOMINIQUE LOUIS NEST , ROOSBROECK YVES EMIEL MARIA VA
IPC: A61K31/00 , A61K31/4427 , A61K31/443 , A61K31/4433 , A61K31/445 , A61K31/4465 , A61K31/4523 , A61K31/454 , A61K31/4545 , A61K31/47 , A61K31/4709 , A61K31/495 , A61K31/4965 , A61K31/497 , A61K31/498 , A61K31/505 , A61K31/506 , A61P43/00 , C07D211/44 , C07D211/46 , C07D211/52 , C07D211/58 , C07D401/06 , C07D401/14 , C07D405/14 , C07D409/14 , C07D417/14 , C07D471/10 , C07D491/10 , C07D491/113
Abstract: The present invention concerns compounds of formulathe N-oxide forms, the pharmaceutically acceptable addition salts and stereochemically isomeric forms thereof, wherein n is 0, 1 or 2; m is 1 or 2, provided that if m is 2, then n is 1; p is 0, 1 or 2; =Q is =O or =NR3; X is a covalent bond or a bivalent radical of formula -O-, -S-, -NR3-; R1 is Ar1; Ar1C1-6alkyl or di(Ar1)C1-6alkyl, wherein each C1-6alkyl group is optionally substituted with hydroxy, C1-4alkyloxy, oxo or a ketalized oxo substituent of formula -O-CH2-CH2-O- or -O-CH2-CH2-CH2-O-; R2 is Ar2; Ar2C1-6alkyl; Het or HetC1-6alkyl; R3 is hydrogen or C1-6alkyl; R4 is hydrogen; C1-4alkyl; C1-4aklyloxyC1-4alkyl; hydroxyC1-4alkyl; carboxyl; C1-4aklyloxycarbonyl or Ar3; R5 is hydrogen; hydroxy; Ar3; Ar3C1-6alkyloxy; di(Ar3)C1-6alkyloxy; Ar3C1-6alkylthio; di(Ar3)C1-6alkylthio; Ar3C1-6alkylsulfoxy; di(Ar3)C1-6alkylsulfoxy; Ar3C1-6alkylsulfonyl; di(Ar3)C1-6alkylsulfonyl; -NR7R8; C1-6alkyl substituted with -NR7R8; or a radical of formula (a-1) or (a-2); R4 and R5 may also be taken together; R6 is hydrogen; hydroxy; C1-6alkyloxy; C1-6alkyl or Ar3C1-6alkyl; Ar1, Ar2 and Ar3 are phenyl or
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33.
公开(公告)号:CA2238818C
公开(公告)日:2006-10-17
申请号:CA2238818
申请日:1996-12-20
Applicant: JANSSEN PHARMACEUTICA NV
Inventor: JANSSENS FRANS EDUARD , SOMMEN FRANCOIS MARIA , SURLERAUX DOMINIQUE LOUIS NEST , VAN ROOSBROECK YVES EMIEL MARI
IPC: C07D401/14 , A61K31/00 , A61K31/4427 , A61K31/443 , A61K31/4433 , A61K31/445 , A61K31/4465 , A61K31/4523 , A61K31/454 , A61K31/4545 , A61K31/47 , A61K31/4709 , A61K31/495 , A61K31/4965 , A61K31/497 , A61K31/498 , A61K31/505 , A61K31/506 , A61K31/535 , A61K31/54 , A61K31/55 , A61P43/00 , C07D211/04 , C07D211/44 , C07D211/46 , C07D211/52 , C07D211/58 , C07D211/94 , C07D401/06 , C07D403/14 , C07D405/14 , C07D409/14 , C07D413/14 , C07D417/14 , C07D471/10 , C07D491/10 , C07D491/113
Abstract: The present invention concerns compounds of formula (I), the N-oxide forms, the pharmaceutically acceptable addition salts and stereochemically isomeric forms thereof, wherein n is 0, 1 or 2; m is 1 or 2, provided that if m is 2, then n is 1; p is 0, 1 or 2; =Q is =O or =NR3; X is a covalent bond or a bivalent radical of formula -O-, -S-, -NR3 ; R1 is Ar1; Ar1C1-6alkyl or di(Ar1)C1- 6alkyl, wherein each C1-6alkyl group is optionally substituted with hydroxy, C1-4alkyloxy, oxo or a ketalized oxo substituent of formula -O - CH2-CH2-O- or -O-CH2-OH2-CH2-O-; R2 is Ar2; Ar2C1-6alkyl; Het or HetC1-6alkyl; R3 is hydrogen or C1-6alkyl; R4 is hydrogen; C1-4alkyl; C1-4alkyloxyC1-4alkyl; hydroxyC1-4alkyl; carboxyl; C1-4alkyloxycarbonyl or Ar3; R5 is hydrogen; hydroxy Ar3; Ar3C1-6alkyloxy; di(Ar3)C1-6alkyloxy Ar3C1-6alkylthio; di(Ar3)C1-6alkylthio; Ar3C1-6alkylsulfoxy; di(Ar3)C1-6alkylsulfoxy Ar3C1-6alkylsulfonyl; di(Ar3)C1 - 6alkylsufonyl; -NR7R8; C1-6alkyl substituted with -NR7R8; or a radical of formula (a-1) or (a-2); R4 and R5 may also be taken together- R 6 is hydrogen; hydroxy; C1-6alkyloxy; C1-6alkyl or Ar3C1-6alkyl; Ar1, Ar2 and Ar3 are phenyl or substituted phenyl; Ar2 is also naphthalenyl; and Het is an optionally substituted monocyclic or bicyclic heterocycle; as substance P antagonists; their preparation, compositions containing them and their use as a medecine.
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公开(公告)号:CA2238816C
公开(公告)日:2006-03-21
申请号:CA2238816
申请日:1996-12-20
Applicant: JANSSEN PHARMACEUTICA NV
Inventor: JANSSENS FRANS EDUARD , SURLERAUX DOMINIQUE LOUIS NEST , LEENAERTS JOSEPH ELISABETH , SOMMEN FRANCOIS MARIA
IPC: C07D413/14 , A61K31/00 , A61K31/415 , A61K31/435 , A61K31/4418 , A61K31/4427 , A61K31/443 , A61K31/4433 , A61K31/4439 , A61K31/444 , A61K31/445 , A61K31/4465 , A61K31/4523 , A61K31/454 , A61K31/4545 , A61K31/47 , A61K31/4709 , A61K31/495 , A61K31/4965 , A61K31/497 , A61K31/498 , A61K31/55 , A61P1/00 , A61P9/00 , A61P11/00 , A61P17/00 , A61P25/00 , A61P25/04 , A61P29/00 , A61P35/00 , A61P37/00 , A61P43/00 , C07D401/06 , C07D401/12 , C07D401/14 , C07D403/12 , C07D405/14 , C07D409/14 , C07D417/14 , C07D471/04
Abstract: This invention concerns the compounds of formula (I), (see formula I) the N-oxide forms, the pharmaceutically acceptable addition salts and the stereochemically isomeric forms thereof, wherein n is 0, 1 or 2; m is 1 or 2 , provided that if m is 2, then n is 1; X is a covalent bond or a bivalent radical of formula -O-, -S-, -NR3-; =Q is =O or =NR3; R1 is Ar1, Ar1C1-6alkyl or di(Ar1)C1-6alkyl wherein the C1-6alkyl group is optionally substituted; R2 is Ar2, Ar2C1-6alkyl, Het or HetC1-6alkyl; L is a benzimidazole or imidazopyridine derivative of formula (A) or (B); (see formula II) wherein p is 0, 1 or 2; (see formula III)Y~ is a bivalent radical of formula -CH2-, -CH(OH)-, -C(=O) -, -O-, -S-, - S(=O)-, -S(=O)2-, -NR3-, -CH2-NR3- or -C(=O)-NR3-; or a trivalent radical of formula =CH-; -A=B- is a bivalent radical of formula -CH=CH-, -N=CH- or -CH=N-; R3 independently is hydrogen or C1-6alkyl; R4 is hydrogen, C1-6alkyl, C3-7cycloalkyl or a radical of formula -Alk-R7 ~(c-1) or -Alk Z-R8 ~(c-2); wherein Alk is C1-6alkanediyl; Z is a bivalent radical of formula -O-, -S- or -NR3-; R7 is phenyl; phenyl substituted with 1 or 2 substituents selected from halo, C1-6alkyl and . C1-6alkyloxy; furanyl; furanyl substituted with 1 or 2 ~~ substituents selected from C1-6alkyl, and hydroxyC1-6alkyl;thienyl; thienyl substituted with 1 or 2 substituents selected from halo and C1-6alkyl; oxazolyl; oxazolyl substituted with 1 or 2 C1-6alkyl substituents; thiazolyl; thiazolyl substituted with 1 or 2 C1-6alkyl substituents; pyridinyl or pyridinyl substituted with 1 or 2 C1-6alkyl substituents; R8 is C1-6alkyl or C1-6alkyl substituted with hydroxy, carboxyl or C1-6alkyloxycarbonyl; R5 is hydrogen, halo, hydroxy or C1-6alkyloxy; R6 is hydrogen, C1-6alkyl or Ar1C1-6alkyl; Ar1 is optionally substituted phenyl; Ar2 is naphtalenyl or optionally substituted phenyl; and Het is an optionally substituted monocyclic or bycyclic heterocycle; as substance P antagonists; their preparation, compositions containing them and their use as a medicine.
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公开(公告)号:CZ296316B6
公开(公告)日:2006-02-15
申请号:CZ186498
申请日:1996-12-20
Applicant: JANSSEN PHARMACEUTICA NV
Inventor: JANSSENS FRANS EDUARD , SOMMEN FRAN OIS MARIA , SURLERAUX DOMINIQUE LOUIS NEST , VAN ROOSBROECK YVES EMIEL MARI
IPC: C07D211/44 , A61K31/00 , A61K31/4427 , A61K31/443 , A61K31/4433 , A61K31/445 , A61K31/4465 , A61K31/4523 , A61K31/454 , A61K31/4545 , A61K31/47 , A61K31/4709 , A61K31/495 , A61K31/4965 , A61K31/497 , A61K31/498 , A61K31/505 , A61K31/506 , A61P43/00 , C07D211/46 , C07D211/52 , C07D211/58 , C07D401/06 , C07D401/14 , C07D405/14 , C07D409/14 , C07D417/14 , C07D471/10 , C07D491/10 , C07D491/113
Abstract: 1-(1,2-Disubstituovaný piperidyl)-4-substituovanýderivát piperidinu, kde jednotlivé symboly mají specifický význam, jeho N-oxidová forma, farmaceuticky prijatelná adicní sul a stereochemicky izomerní forma. Zpusob jeho prípravy a pouzití, farmaceutický prostredek s jeho obsahem a zpusob jeho prípravy. Deriváty vzorce I jsou antagonisty substance P.
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公开(公告)号:ES2200159T3
公开(公告)日:2004-03-01
申请号:ES97908226
申请日:1997-03-11
Applicant: JANSSEN PHARMACEUTICA NV
Inventor: JANSSENS FRANS EDUARD , LEENAERTS JOSEPH ELISABETH , SOMMEN FRANCOIS MARIA , SURLERAUX DOMINIQUE LOUIS NEST
IPC: A61K31/00 , A61K31/445 , A61K31/47 , A61K31/4738 , A61K31/4745 , A61K31/5365 , A61K31/55 , A61K31/553 , A61K45/00 , A61P31/00 , A61P31/06 , A61P33/00 , A61P33/02 , A61P33/04 , A61P33/06 , A61P35/00 , A61P35/02 , A61P43/00 , C07D471/04 , C07D487/04 , C07D487/14 , C07D491/147 , C07D495/14 , C07D498/04 , C07D498/14
Abstract: This invention concerns the compounds of formulathe N-oxide forms, the pharmaceutically acceptable addition salts and the stereochemically isomeric forms thereof, wherein the dotted line is an optional bond; n is 1 or 2; R1 is hydrogen; halo; formyl; C1-4alkyl optionally substituted with hydroxy, C1-4alkyloxy, C1-4alkylcarbonyloxy, imidazolyl, thiazolyl or oxazolyl; or a radical of formula -X-COOR5, -X-CONR6R7 or -X-COR10 wherein -X- is a direct bond, C1-4alkanediyl or C2-6alkenediyl; R5 is hydrogen, C1-12alkyl, Ar, Het, C1-6alkyl substituted with C1-4alkyloxy, aryl or heteroaryl; R6 and R7 each independently are hydrogen or C1-4alkyl; R2 is hydrogen, halo, C1-4alkyl, hydroxyC1-4alkyl, C1-4alkyloxycarbonyl, carboxyl, formyl or phenyl; R3 is hydrogen, C1-4alkyl or C1-4alkyloxy; R4 is hydrogen, halo, C1-4alkyl, C1-4alkyloxy or haloC1-4alkyl; Z is -CH2-, -CH2-CH2-, -CH=CH-, -CHOH-CH2-, -O-CH2-, -C(=O)-CH2- or -C(=NOH)-CH2-; -A-B- is a bivalent radical; A1 is a direct bond, optionally substituted C1-6alkanediyl, C1-6alkanediyl-oxy-C1-6alkanediyl, carbonyl, C1-6alkanediylcarbonyl, optionally substituted C1-6alkanediyloxy; A2 is a direct bond or C1-6alkanediyl; and Q is aryl. Processes for preparing said products, formulations comprising said products and their use as a medicine are disclosed, in particular for inhibiting or reversing the effects of multidrug resistance.
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37.
公开(公告)号:SK283533B6
公开(公告)日:2003-09-11
申请号:SK82998
申请日:1996-12-20
Applicant: JANSSEN PHARMACEUTICA NV
Inventor: JANSSENS FRANS EDUARD , SOMMEN FRANCOIS MARIA , SURLERAUX DOMINIQUE LOUIS NEST , LEENAERTS JOSEPH ELISABETH
IPC: A61K31/00 , A61K31/415 , A61K31/435 , A61K31/4418 , A61K31/4427 , A61K31/443 , A61K31/4433 , A61K31/4439 , A61K31/444 , A61K31/445 , A61K31/4465 , A61K31/4523 , A61K31/454 , A61K31/4545 , A61K31/47 , A61K31/4709 , A61K31/495 , A61K31/4965 , A61K31/497 , A61K31/498 , A61K31/55 , A61P1/00 , A61P9/00 , A61P11/00 , A61P17/00 , A61P25/00 , A61P25/04 , A61P29/00 , A61P35/00 , A61P37/00 , A61P43/00 , C07D401/06 , C07D401/12 , C07D401/14 , C07D403/12 , C07D405/14 , C07D409/14 , C07D413/14 , C07D417/14 , C07D471/04
Abstract: This invention concerns the compounds of formula (I), the N-oxide forms, the pharmaceutically acceptable addition salts and the stereochemically isomeric forms thereof, wherein n is 0, 1 or 2; m is 1 or 2, provided that if m is 2, then n is 1; X is a covalent bond or a bivalent radical of formula -O-, -S-, -NR3-; =Q is =O or =NR3; R1 is Ar1, Ar1C1-6alkyl or di(Ar1)C1-6alkyl wherein the C1-6alkyl group is optionally substituted; R2 is Ar2, Ar2C1-6alkyl, Het or HetC1-6alkyl; L is a benzimidazole or imidazopyridine derivative of formula (A) or (B); Ar1 is optionally substituted phenyl; Ar2 is naphtalenyl or optionally substituted phenyl; and Het is an optionally substituted monocyclic or bicyclic heterocycle; as substance P antagonists; their preparation, compositions containing them and their use as a medicine.
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公开(公告)号:EE03773B1
公开(公告)日:2002-06-17
申请号:EE9800281
申请日:1997-03-11
Applicant: JANSSEN PHARMACEUTICA NV
Inventor: JANSSENS FRANS EDUARD , LEENAERTS JOSEPH ELISABETH , SOMMEN FRANCOIS MARIA , SURLERAUX DOMINIQUE LOUIS NEST
IPC: A61K31/00 , A61K31/445 , A61K31/47 , A61K31/4738 , A61K31/4745 , A61K31/5365 , A61K31/55 , A61K31/553 , A61K45/00 , A61P31/00 , A61P31/06 , A61P33/00 , A61P33/02 , A61P33/04 , A61P33/06 , A61P35/00 , A61P35/02 , A61P43/00 , C07D471/04 , C07D487/04 , C07D487/14 , C07D491/147 , C07D495/14 , C07D498/04 , C07D498/14
Abstract: This invention concerns the compounds of formulathe N-oxide forms, the pharmaceutically acceptable addition salts and the stereochemically isomeric forms thereof, wherein the dotted line is an optional bond; n is 1 or 2; R1 is hydrogen; halo; formyl; C1-4alkyl optionally substituted with hydroxy, C1-4alkyloxy, C1-4alkylcarbonyloxy, imidazolyl, thiazolyl or oxazolyl; or a radical of formula -X-COOR5, -X-CONR6R7 or -X-COR10 wherein -X- is a direct bond, C1-4alkanediyl or C2-6alkenediyl; R5 is hydrogen, C1-12alkyl, Ar, Het, C1-6alkyl substituted with C1-4alkyloxy, aryl or heteroaryl; R6 and R7 each independently are hydrogen or C1-4alkyl; R2 is hydrogen, halo, C1-4alkyl, hydroxyC1-4alkyl, C1-4alkyloxycarbonyl, carboxyl, formyl or phenyl; R3 is hydrogen, C1-4alkyl or C1-4alkyloxy; R4 is hydrogen, halo, C1-4alkyl, C1-4alkyloxy or haloC1-4alkyl; Z is -CH2-, -CH2-CH2-, -CH=CH-, -CHOH-CH2-, -O-CH2-, -C(=O)-CH2- or -C(=NOH)-CH2-; -A-B- is a bivalent radical; A1 is a direct bond, optionally substituted C1-6alkanediyl, C1-6alkanediyl-oxy-C1-6alkanediyl, carbonyl, C1-6alkanediylcarbonyl, optionally substituted C1-6alkanediyloxy; A2 is a direct bond or C1-6alkanediyl; and Q is aryl. Processes for preparing said products, formulations comprising said products and their use as a medicine are disclosed, in particular for inhibiting or reversing the effects of multidrug resistance.
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公开(公告)号:ES2164939T3
公开(公告)日:2002-03-01
申请号:ES96944691
申请日:1996-12-20
Applicant: JANSSEN PHARMACEUTICA NV
Inventor: JANSSENS FRANS EDUARD , SOMMEN FRANCOIS MARIA , SURLERAUX DOMINIQUE LOUIS NEST , VAN ROOSBROECK YVES EMIEL MARI
IPC: A61K31/00 , A61K31/4427 , A61K31/443 , A61K31/4433 , A61K31/445 , A61K31/4465 , A61K31/4523 , A61K31/454 , A61K31/4545 , A61K31/47 , A61K31/4709 , A61K31/495 , A61K31/4965 , A61K31/497 , A61K31/498 , A61K31/505 , A61K31/506 , A61P43/00 , C07D211/44 , C07D211/46 , C07D211/52 , C07D211/58 , C07D401/06 , C07D401/14 , C07D405/14 , C07D409/14 , C07D417/14 , C07D471/10 , C07D491/10 , C07D491/113
Abstract: The present invention concerns compounds of formulathe N-oxide forms, the pharmaceutically acceptable addition salts and stereochemically isomeric forms thereof, wherein n is 0, 1 or 2; m is 1 or 2, provided that if m is 2, then n is 1; p is 0, 1 or 2; =Q is =O or =NR3; X is a covalent bond or a bivalent radical of formula -O-, -S-, -NR3-; R1 is Ar1; Ar1C1-6alkyl or di(Ar1)C1-6alkyl, wherein each C1-6alkyl group is optionally substituted with hydroxy, C1-4alkyloxy, oxo or a ketalized oxo substituent of formula -O-CH2-CH2-O- or -O-CH2-CH2-CH2-O-; R2 is Ar2; Ar2C1-6alkyl; Het or HetC1-6alkyl; R3 is hydrogen or C1-6alkyl; R4 is hydrogen; C1-4alkyl; C1-4aklyloxyC1-4alkyl; hydroxyC1-4alkyl; carboxyl; C1-4aklyloxycarbonyl or Ar3; R5 is hydrogen; hydroxy; Ar3; Ar3C1-6alkyloxy; di(Ar3)C1-6alkyloxy; Ar3C1-6alkylthio; di(Ar3)C1-6alkylthio; Ar3C1-6alkylsulfoxy; di(Ar3)C1-6alkylsulfoxy; Ar3C1-6alkylsulfonyl; di(Ar3)C1-6alkylsulfonyl; -NR7R8; C1-6alkyl substituted with -NR7R8; or a radical of formula (a-1) or (a-2); R4 and R5 may also be taken together; R6 is hydrogen; hydroxy; C1-6alkyloxy; C1-6alkyl or Ar3C1-6alkyl; Ar1, Ar2 and Ar3 are phenyl or
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40.
公开(公告)号:SI0855999T1
公开(公告)日:2001-12-31
申请号:SI9630359
申请日:1996-12-20
Applicant: JANSSEN PHARMACEUTICA NV
Inventor: JANSSENS FRANS EDUARD , SOMMEN FRANCOIS MARIA , SURLERAUX DOMINIQUE LOUIS NEST , VAN ROOSBROECK YVES EMIEL MARI
IPC: A61K31/00 , A61K31/4427 , A61K31/443 , A61K31/4433 , A61K31/445 , A61K31/4465 , A61K31/4523 , A61K31/454 , A61K31/4545 , A61K31/47 , A61K31/4709 , A61K31/495 , A61K31/4965 , A61K31/497 , A61K31/498 , A61K31/505 , A61K31/506 , A61P43/00 , C07D211/44 , C07D211/46 , C07D211/52 , C07D211/58 , C07D401/06 , C07D401/14 , C07D405/14 , C07D409/14 , C07D417/14 , C07D471/10 , C07D491/10 , C07D491/113
Abstract: The present invention concerns compounds of formulathe N-oxide forms, the pharmaceutically acceptable addition salts and stereochemically isomeric forms thereof, wherein n is 0, 1 or 2; m is 1 or 2, provided that if m is 2, then n is 1; p is 0, 1 or 2; =Q is =O or =NR3; X is a covalent bond or a bivalent radical of formula -O-, -S-, -NR3-; R1 is Ar1; Ar1C1-6alkyl or di(Ar1)C1-6alkyl, wherein each C1-6alkyl group is optionally substituted with hydroxy, C1-4alkyloxy, oxo or a ketalized oxo substituent of formula -O-CH2-CH2-O- or -O-CH2-CH2-CH2-O-; R2 is Ar2; Ar2C1-6alkyl; Het or HetC1-6alkyl; R3 is hydrogen or C1-6alkyl; R4 is hydrogen; C1-4alkyl; C1-4aklyloxyC1-4alkyl; hydroxyC1-4alkyl; carboxyl; C1-4aklyloxycarbonyl or Ar3; R5 is hydrogen; hydroxy; Ar3; Ar3C1-6alkyloxy; di(Ar3)C1-6alkyloxy; Ar3C1-6alkylthio; di(Ar3)C1-6alkylthio; Ar3C1-6alkylsulfoxy; di(Ar3)C1-6alkylsulfoxy; Ar3C1-6alkylsulfonyl; di(Ar3)C1-6alkylsulfonyl; -NR7R8; C1-6alkyl substituted with -NR7R8; or a radical of formula (a-1) or (a-2); R4 and R5 may also be taken together; R6 is hydrogen; hydroxy; C1-6alkyloxy; C1-6alkyl or Ar3C1-6alkyl; Ar1, Ar2 and Ar3 are phenyl or
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