Enantioselective synthesis of the lactone moiety of HMG-CoA reductase inhibitor: stereoselective synthesis of (+)-(4R,6R)-4-hydroxy-6-(2-phenylethyl)-tetrahydro-2H-pyran-2-one
作者:Toshio Honda、Satoko Ono、Hirotake Mizutani、Keith O. Hallinan
DOI:10.1016/s0957-4166(96)00525-3
日期:1997.1
The enantioselective synthesis of the lactonemoiety of (+)-compactin and (+)-mevinolin was established starting from a meso-3,5-dihydroxycyclohexanone derivative by employing an enantioselective deprotonation strategy.
Involvement of an Oxonium Ion Intermediate in Controlling the Diastereoselectivity of Nucleophilic Substitution Reactions of Septanoses
作者:Khoi B. Luu、K. A. Woerpel
DOI:10.1021/acs.orglett.2c03963
日期:2023.1.13
of septanoses control the stereochemical outcomes of O-glycosylation reactions of these seven-membered-ring intermediates. Isolation of a bicyclic acetal byproduct in some substitutionreactions suggests that the C4 benzyloxy substituent engaged in long-range participation, stabilizing intermediates by the formation of an oxonium ion intermediate. Inductive destabilization of the carbocationic intermediate