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
L
TMP(5当量)将
金属无定形
金属(1)
金属化。在外部淬火条件下,热力学上更稳定的2-lithio-3,4-dimethoxybenzoate
锂(2)与各种亲电试剂反应生成通用的建筑单元,而这些单元是常规方法不易获得的。在原位淬灭条件(L
TMP / TMSCl)下,观察到区域选择性的逆转并且主要形成6-三甲基甲
硅烷基-3,4-二
甲氧基苯甲酸(10)。