Method of preparing a heterocyclic intermediate for the production of optically active aryloxy-substituted vicinal aminoalcohols
申请人:DUPHAR INTERNATIONAL RESEARCH B.V
公开号:EP0647634A1
公开(公告)日:1995-04-12
The invention relates to a method of preparing a heterocyclic intermediate of the general formula
wherein
X is a carbonyl group, a thiocarbonyl group, a (C₁-C₁₀)(ar)alkylidene group or a dihydrocarbylsilyl group,
R is a straight or branched (C₁-C₁₀)alkyl group, optionally substituted with halogen, hydroxy, (C₁-C₄) alkoxy or protected hydroxy, or a phenyl(C₁-C₃)alkyl or heteroaryl(C₁-C₃)alkyl group, which groups are optionally substituted with 1-3 substituents, selected from the group consisting of hydroxy, (C₅-C₁₂)cycloalkyl, amino, nitro, halogen, cyano, alkoxy, alkylcarbonyloxy, alkylcarbonylamino, alkylsulphonylamino, alkylsulphonyl, alkylcarbonyl, and alkyl, wherein the alkyl groups have 1-5 carbon atoms,
and which intermediate has either the R or the S configuration, by subjecting an optically active cyanohydrin of the general formula
to a reduction-transimination-reduction sequence, using R - NH₂ as the primary amine,
followed by a cyclization reaction and, finally, by an ozonolysis-reduction sequence.
本发明涉及一种通式如下的杂环中间体的制备方法
其中
X 是羰基、硫代羰基、(C₁-C₁₀)(ar)亚烷基或二氢羰基硅烷基、
R 是直链或支链(C₁-C₁₀)烷基,可选择被卤素、羟基、(C₁-C₄)烷氧基或受保护羟基取代,或苯基(C₁-C₃)烷基或杂芳基(C₁-C₃)烷基,这些基团可选择被 1-3 个取代基取代、选自由羟基、(C₅-C₁₂)环烷基、氨基、硝基、卤素、氰基、烷氧基、烷基羰氧基、烷基羰基氨基、烷基磺酰基氨基、烷基磺酰基、烷基羰基和烷基组成的组,其中烷基具有 1-5 个碳原子、
将通式如下的具有光学活性的氰醇与具有 R 或 S 构型的中间体反应
以 R - NH₂ 作为伯胺,进行还原-反式-还原反应、
然后进行环化反应,最后进行臭氧分解还原反应。