摘要:
The present disclosure relates to the field of medicine synthesis, and relates to a method for a racemic preparation of chiral β -amino acids and derivatives thereof, and in particular to a method for racemizing sitagliptin intermediates.
where R 1 is hydrogen, alkyl or aryl; R 2 is hydrogen, alkyl or aryl; R 3 is hydrogen, alkyl, aryl or acyl; R 4 is alkyl, aryl, OR', SR', NHR' or NR'R", wherein R', R" are hydrogen, alkyl or aryl.
摘要:
Disclosed are novel intermediates for use in preparing DPP-IV inhibitors, methods for preparing the same, and methods for preparing DPP-IV inhibitors using the same. Using the novel intermediates of the present invention, highly pure DPP-IV inhibitors can be produced in a simple and economical manner at a high yield.
摘要:
The present invention relates to novel compounds of general formula (I) which are thyroid receptor ligands and are preferably selective for the thyroid hormone receptor beta(TR-Beta). Further, the present invention relates to processes of preparing such compounds, their tautomeric forms, novel intermediates involved in their synthesis, their pharmaceutically acceptable salts, methods for using such compounds and pharmaceutical compositions containing them.
摘要:
A practical chiral zirconium catalyst, characterized in that a chiral zirconium catalyst is fixed on a zeolite. The practical chiral zirconium catalyst can maintain high catalyst activity after the storage for a long period of time, is stable also in air, can be recovered and reused after reaction, and thus exhibits high practicality.
摘要:
As a process for preparing 2,3-dihydroazepine compounds at low cost in a simple and easy manner, there is provided a process for the preparation of compounds of the formula: or salts thereof, characterized in that compounds of the formula: or salts thereof are reacted with compounds of the formula: or salts thereof to give compounds of the formula: or salts thereof, which are then subjected to esterification and ring-closing reaction.