Asymmetric synthesis of sulfinyl-substituted arene chromium tricarbonyl complexes
作者:Stephen G. Davies、Tracey Loveridge、M. Fatima C. C. Teixeira、John M. Clough
DOI:10.1039/a907590i
日期:——
The synthesis of (SRSS)-[(phenylsulfinyl)benzene] chromiumtricarbonyl 5 and (SRSS)-[(p-tolylsulfinyl)benzene] chromiumtricarbonyl6 is achieved via a nucleophilic displacement reaction between the anion derived from (benzene) chromiumtricarbonyl 9 and a suitable sulfinate ester. Replacing the sulfinate ester with a chiral sulfinyl-transfer reagent allows the isolation of the non-racemic sulfinyl-substituted
The enantioselective synthesis of (-)-physostigmine via chiral sulfoxides
作者:J. P. Marino、S. Bogdan、K. Kimura
DOI:10.1021/ja00040a013
日期:1992.7
The total synthesis of naturally occurring (-)-physostigmine is described. The key element for the asymmetric induction is the chirality transfer from optically active 2-(alkylsulfinyl)indoles to indoline butyrolactones bearing two chiral centers. Novel features of this synthesis involve the use of a new class of sulfoxylating agents, N-(alkylsulfinyl)oxazolidinones, to prepare the starting indolyl sulfoxides and the correlation of the size of the alkyl group on the sulfoxide with the degree of asymmetric induction. The overall synthesis requires a dozen steps from commercially available 5-(benzyloxy)indole.