A variety of pyroglutamic acid derivatives are readily synthesized via N-acylindole intermediates obtained by the Ugi reaction. For the preparation of functionalized pyroglutamic acid derivatives, the diastereoselectivity of the Ugi 4-center 3-component condensation reaction with a chiral γ-keto acid and convertible isocyanide is described.
通过 Ugi 反应获得的 N-酰基吲哚中间体可以很容易地合成多种焦谷氨酸衍生物。对于功能化焦谷氨酸衍生物的制备,描述了 Ugi 4 中心 3 组分缩合反应与手性 γ-酮酸和可转化异氰化物的非对映选择性。