Abstract:
PURPOSE: A method of preparing oxiracetam is provided to make oxiracetam product in high purity and yield. The oxiracetam improves brain functions and therapeutic effect on dementia. CONSTITUTION: In a method of preparing oxiracetam of the formula(1), a tri-amide compound of the formula(2) is first prepared by reacting an organic solvent compound of the formula(4) with an organic solvent compound of the formula(5). A compound of the formula(3) is prepared by sequentially conducting cyclization, decarboxylation and reduction with respect to the compound of the formula(2). The compound of the formula(3) reacts with ammonia under the existence of water or alcohol. In the formulae, R is methyl group or ethyl group, and X is hydroxy group or halide. The cyclization of the compound of the formula(2) is achieved by reaction with hydride or alkoxide at -30-50 deg.C for 1-15 hours.
Abstract:
PURPOSE: Provided is a method for preparing 3-methoxyimino-4-aminomethylpyrrolidine derivatives, which are used as a useful substituent for the position No.7 of quinolone antibiotics, from 1-benzyl-3-oxo-4-ethoxycarbo0nylpyrrolidine. CONSTITUTION: The method comprises the steps of: reacting a compound of the formula(2) with oxoamine compound or its salt to prepare a compound of the formula(3); reducing a compound of the formula(3) to prepare a compound of the formula(4); hydrogenating and amine-protecting the compound of the formula(4) to prepare a compound of the formula(5); sulfonating the compound of the formula(5) to prepare a compound of the formula(6); aminating or azidonating the compound of the formula(6) to prepare a compound of the formula(8a) or a compound of the formula(7) respectively; hydrogenating the compound of the formula(7) to prepare a compound of the formula(8a) or reacting the compound of the formula(6) with amide to prepare a compound of the formula(8b); and reacting the compound of the formula(8a) or (8b) with acid to deprotect amine.
Abstract:
This invention relates to the pharmaceutical composite containing benzopyran group hydroxylmethyl metabolite or its derivatives useful to reduce blood pressure wherein the benzopyran derivatives having following formula(I). In the formula, R1 is -CN, -NO2, OCX1X2X3, NH2, -NHSO2Ra, -NHCORb, -CONRcRd, -SO2Rc or -SO2NRcRd wherein X1, X2 and X3 are separate F, Cl or H; Ra and Rb are separate amino, C1-6 alkoxyl, C1-6 alkyl or phenyl; Rc and Rd are separate halogen, C1-6 alkyl or replaced/or not replaced phenyl; R2 is like the formula where Re is C1-6 alkyl, cyclopropyl, cyclopropyl methyl or benzyl; Rf is -CORa or -CSRa, X is O, S or NRc, and Y is H, C1-6 linear or side chain alkyl, halogen, amino or C16 alkoxy, and n is between 0 and 3; R3 is replaced or not replaced C1-4 linear or side chain alkyl.
Abstract translation:本发明涉及含有苯并吡喃基羟甲基代谢物或其衍生物的药物复合物,其用于降低血压,其中具有下式(I)的苯并吡喃衍生物。 式中,R1为-CN,-NO2,OCX1X2X3,NH2,-NHSO2Ra,-NHCORb,-CONRcRd,-SO2Rc或-SO2NRcRd,其中X1,X2和X3分别为F,Cl或H; R a和R b分别是氨基,C 1-6烷氧基,C 1-6烷基或苯基; Rc和R d分别是卤素,C 1-6烷基或被取代的或未被取代的苯基; R 2如下式,其中Re为C 1-6烷基,环丙基,环丙基甲基或苄基; Rf为-CORa或-CSRa,X为O,S或NRc,Y为H,C1-6直链或侧链烷基,卤素,氨基或C16烷氧基,n为0至3; R3被取代或未被C 1-4直链或侧链烷基取代。
Abstract:
The cpd. of formula (I-a) is prepd. by (a) reacting ketone derivatives of formula (II) with trifluorosulfonic acid anhydride and ter-amine, or making the ketone derivatives (II) to enolate with a base and then reacting N-phenyl trifluoromethane sulfonimide to convert to the vinyl triflate derivs. of formula (III); and (b) reacting the derivs. (III) with trialkyline derivs. of formula (IV). In the formulas, R1 is -CN, -NO2, -OCX1X2X3 or -SO2Rc; X1, X2, and X3 are F, Cl or H(however, X1=X2=X3=H); R2 is straight or branched C1-4 alkyl; R3 is straight or branched C1-4 alkyl, etc; R4 is C1-4 alkyl.
Abstract:
Benzopyran derivatives of formula (I) are prepd. by (a) reacting the epoxy cpd. of formula (II) with a nucleophilic agent contg. cpd. to prepare the alcohol dervs. of formula (III), in the presence of a base; (b) dehydration reacting the cpd. (III) in the presence of a base. In the formulas, R1 is -CN, -NO2, OCX1X2X3 or -SO2Rc; X1, X2 and X3 are eachly F, Cl or H; Rc is H, C1-6 alkyl or opt. satd. phenyl where satd. gp. is halogen, or straight or branched C1-3 alkyl. The obptd. benzopyran dervs. are useful for curing hypertension.