Highly enantioselective phase-transfer alkylation of 3-substituted-2-oxindoles with activated bromomethanes is disclosed with a broad substrate scope by using bicyclic guanidinium as a catalyst and a Lewis acid as the co-catalyst. The alkylation adducts are versatile intermediates to accomplish the syntheses of pyrroloindolines and furoindolines.
本发明以双环
胍为催化剂,以
路易斯酸为助催化剂,实现了 3-取代-2-氧
吲哚与活化
溴甲烷的高对映选择性相转移烷基化反应,具有广泛的底物范围。烷基化加合物是完成
吡咯吲哚和
呋喃吲哚合成的多功能中间体。