Method of preparing optically active cyanohydrin derivatives
申请人:Duphar International Research B.V.
公开号:US05493047A1
公开(公告)日:1996-02-20
The invention relates to a method of preparing an optically active cyanohydrin carboxylic acid ester from an optically active cyanohydrin of opposite configuration, wherein said starting cyanohydrin is converted with a carboxylic acid in the presence of a dialkyl azodicarboxylate and a triarylphosphine. The invention also relates to a method of preparing an optically active cyanohydrin of opposite configuration by a subsequent solvolysis of the ester obtained under conservation of the configuration.
Warmerdam, E. G. J. C.; Brussee, J.; Kruse, C. G., Phosphorus, Sulfur and Silicon and the Related Elements, 1993, vol. 75, # 1-4, p. 3 - 6
作者:Warmerdam, E. G. J. C.、Brussee, J.、Kruse, C. G.、Gen, A. van der
DOI:——
日期:——
US5493047A
申请人:——
公开号:US5493047A
公开(公告)日:1996-02-20
Inversion of the configuration of cyanohydrins by a mitsunobu esterification reaction
作者:Erwin G.J.C. Warmerdam、Johannes Brussee、Chris G. Kruse、Arne van der Gen
DOI:10.1016/s0040-4020(01)86287-6
日期:1993.1
Optically active (R)-cyanohydrins have been transformed into cyanohydrin esters of opposite configuration under Mitsunobu conditions and subsequently solvolyzed to (S)-cyanohydrins in high chemical and optical yield. The method works well for allylic and benzylic cyanohydrins. Cyanohydrins containing strongly electron donating substituents gave extensive racemization. Saturated aliphatic cyanohydrins