Enzymic Asymmetrization of 6-Amino-2-cycloheptene-1,4-diol Derivatives: Synthesis of Tropane Alkaloids (+)- and (-)-Calystegine A3
摘要:
6-Azido and 6-((tert-butyloxycarbonyl)amino)derivatives of meso-2-cycloheptene-1,4-diol were prepared from cycloheptatriene and asymmetrized using Pseudomonas cepacia lipase. Enantiopure intermediates thus prepared were used in the syntheses of both enantiomers of the tropane alkaloid calystegine A(3).
Enantio- and diastereoselective transformations of cycloheptatriene to sugars and related products
作者:Carl R. Johnson、Adam Golebiowski、Darryl H. Steensma、Mark A. Scialdone
DOI:10.1021/jo00077a049
日期:1993.12
Both meso diastereomers of 6-[(tert-butyldimethylsilyl)oxy]-2-cycloheptene-1,4-diol, prepared from cycloheptatriene, have been enzymatically asymmetrized by conversion to monoacetates using Pseudomonas cepacia lipase in isopropenyl acetate. A study of protecting group manipulations, diastereoselective oxidations, and regioselective ring openings utilizing these enantiopure monacetates which results in the synthesis of all possible methyl 2,4-dideoxyhexopyranosides is described.