Abstract:
The invention relates to a method for producing isoxazolene of the formula (I), where the substituents have the following meanings: R1 is hydrogen, C¿1?-C6 alkyl, R?2 is C¿1-C6 alkyl, R?3, R4, R5¿ are hydrogen, C¿1?-C6 alkyl or R?4 and R5¿ together form a linkage, R6 is a heterocyclic ring, and n is 0, 1 or 2. Said method comprises the production of an intermediate compound of the formula (VI) where R?1, R3, R4 and R5¿ have the meanings given above. This step is followed by halogenation, thiomethylation, oxidation and acylation to yield compounds of formula (I). The invention also relates to new intermediate products for producing compounds of formula (I) and new methods for producing the intermediate products.
Abstract:
A method of nitrating electron-deficient carbocyclic or heterocyclic aromatic compounds such as pyridines, diazines and triazines and benzenoid aromatics having electron-withdrawing substituents involves first reacting the aromatic species with a sulphilimine species or with the corresponding N-alkali metal salt thereof to generate an N-(hetero)aryl-S,S-dialkyl, diaryl or alkylarylsulphilimine derivative. This intermediate may then be readily oxidised under relatively mild conditions using a peroxycarboxylic acid such as m-chloroperbenzoic acid, peracetic or peroxytrifluoroacetic acid. Good yields of nitrated products are obtained including some previously unprepared. The novel N-alkali(alkylaryl)sulphilimine reagents are prepared by reacting an alkali metal hydride, an alkali metal hydrogenous base or an alkyl lithium with the corresponding sulphilimine. Preferred salts are the N-lithio types and the preferred sulphilimine is diphenylsulphilimine. Where the salt is used reaction should be in an aprotic solvent but if the sulphilimine per se is the reagent a polar solvent is used.
Abstract:
PROBLEM TO BE SOLVED: To provide a novel process of preparing a himbacine analog useful as a thrombin receptor antagonist.SOLUTION: A novel process of preparing a compound 11 from a compound 1 is provided, achieving an improved yield and eliminating the need for a chiral intermediate. The process is based in part on the use of a base-promoted dynamic epimerization of a chiral nitro center. In another embodiment, a compound prepared by the above process is provided.
Abstract:
PROBLEM TO BE SOLVED: To provide a new process for preparing himbacine analogs useful as thrombin receptor antagonists. SOLUTION: There is provided the new process for preparing compound 11 from compound 1 (each described in the specification). The process provides an improved yield and the elimination of the need for chiral intermediates. The process is partially based on the use of base-promoted type dynamic epimerization of a chiral nitro center. In another embodiment, there are provided the compounds prepared by the process. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide an intermediate of an isoxazolin-3-ylacyl benzene useful as an agricultural chemical, and a new method for producing the intermediate. SOLUTION: A benzaldoxime derivative represented by formula III (wherein R 1 is a 1-6C alkyl group) can be obtained by reacting a corresponding methylbenzene derivative with an organic nitrite in an aprotic polar solvent in the presence of a base at lower temperature than -20°C. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
The present application provide processes for the preparation of fingolimod and its pharmaceutically acceptable salts, process for the purification of fingolimod hydrochloride and process for the preparation of amorphous fingolimod hydrochloride.
Abstract:
Disclosed herein is a method for synthesizing terpenoid compounds, as well as compositions comprising terpenoids and methods for their use. In one aspect the process is represented by the scheme: wherein G is:; and X is;and R1, R2 and R3 independently are selected from H, acyl, lower alkyl and aralkyl; and Y is -O-, -S- or -NH-, and R4 is selected from H, acyl, lower alkyl and aralkyl.