You can count on the anion: Simply swapping the anions of an indium Lewis acid leads to a remarkable regioselectivity switch between asymmetric 1,2‐ and 1,4‐addition reactions. N‐protected indoles and β,γ‐unsaturated α‐keto esters gave adducts with excellent enantioselectivity (see scheme).
您可以指望阴离子:简单地交换
铟路易斯酸的阴离子会导致不对称的1,2-和1,4-加成反应之间显着的区域选择性转换。N保护的
吲哚和β,γ-不饱和的α-
酮酯可形成具有出色对映选择性的加合物(参见方案)。