Patent ID: 6590111
Filing Date: 2003-07-08
Classification: C07C,C07D,Y02P

Abstract:
A process for the preparation of cyclohexene derivatives of general formula I or II: in which the substituents R1 and R2 independently of one another are defined as follows: R2 is OH or a protecting group convertible to a hydroxyl group by hydrolysis, R3 and R4 are hydrogen or C1-C4-alkyl, and R5 is hydrogen or C1-C4-acyl, by the reduction of alkyne compounds of general formula III or IV: in which the substituents R1 and R2 are as defined above, wherein the reducing agent used is at least one salt of hyposulfurous acid or hydroxymethanesulfinic acid or a mixture of at least one salt of hyposulfurous acid and at least one salt of hydroxymethanesulfinic acid.