Lipase-catalyzed asymmetric demethoxycarbonylation: Formal syntheses of (+)-carbacyclin, (−)-ajmalicine, and (−)-tetrahydroalstonine
摘要:
Both enantiomers of C-2-symmetric dimethyl 3,7-dihydroxybicyclo[3.3.0]-octa-2,6-dicarboxylate 3 were prepared in enantiomerically pure form from symmetric tetraester 1 by the lipase-catalyzed demethoxycarbonylation, respectively. Double asymmetric differentiation with lipase in the above demethoxycarbonylation was observed. Their applications to formal total syntheses of (+)-carbacyclin and (-)-ajmalicine including (-)-tetrahydroalstonine are also described. (C) 1998 Elsevier Science Ltd. All rights reserved.
Enantioselective hydrolysis of five-membered-ring acetates catalysed by Pseudomonas fluorescens lipase
作者:Zhuo-Feng Xie、Hiroshi Suemune、Kiyoshi Sakai
DOI:10.1039/c39870000838
日期:——
The racemic acetates of five-membered-ring alcohols were successfully resolved into the optically active alcohols with high optical purities by Pseudomonasfluorescenslipase.