Lipase-catalyzed asymmetric demethoxycarbonylation: Formal syntheses of (+)-carbacyclin, (−)-ajmalicine, and (−)-tetrahydroalstonine
作者:Manabu Node、Takehisa Inoue、Mamoru Araki、Daisaku Nakamura、Kiyoharu Nishide
DOI:10.1016/s0957-4166(97)00616-2
日期:1998.1
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.