LTMP (5 equiv) metalates randomly veratric acid (1). Under external quench conditions, the thermodynamically more stable lithium 2-lithio-3,4-dimethoxybenzoate (2) reacts with a variety of electrophiles to give versatile building units that are not easily accessible by conventional means. Under in situ quench conditions (LTMP/TMSCl), a reversal of regioselectivity is observed and 6-trimethylsilyl-3
DERIVES DU GOSSYPOL ET DE L'APOGOSSYPOL, LEURS PREPARATIONS ET LEURS APPLICTIONS
申请人:Mortier Jacques
公开号:US20100331398A1
公开(公告)日:2010-12-30
Gossypol and apogossypol derivatives of general formula (1), preparation thereof and use thereof.
戈西孢酚和戈西孢酚衍生物的一般化学式(1),其制备和用途。
Silicon in benzamide directed ortho metalation reactions. Carbo- and bromo-desilylations and synthesis of naturally-occurring anthraquinones
作者:R.J. Mills、V. Snieckus
DOI:10.1016/s0040-4039(00)99917-9
日期:1984.1
Silylated benzamides 2, available by directedorthometalation, undergo fluoride-induce carbodesilylation and ipso bromodesilylation to give usefully-substituted aromatics 3 and 4; these reactions are utilized in a short and efficient synthesis of erythrolaccin tetramethyl ether 10.