Full control of regioselectivity in linear and angular polyquinane construction from squarate esters by incorporation of a leaving group into a single vinyl anion reactant
作者:Leo A. Paquette、Julien Doyon
DOI:10.1021/ja00130a028
日期:1995.6
C(1)-Substituted menthol derivatives: Self-removing chiral auxiliaries for asymmetric conjugate additions to cycloalkenones
作者:Raymond L. Funk、Ge Yang
DOI:10.1016/s0040-4039(98)02627-6
日期:1999.2
C(1)-substituted (-)-menthone derivatives 3 were prepared by the stereoselective addition of the alkenyllithium reagents 9 to menthone (8) and subsequent acid catalyzed hydrolysis of the dioxolane protecting groups. Conjugate addition of cuprate reagents to enones 3a,b followed by a methanol quench directly gave the beta-alkylcycloalkanones 7 via retro-aldol reactions in 80-91% ee. (C) 1999 Elsevier Science Ltd. All rights reserved.