Multicomponent Synthesis of Cyclic Depsipeptide Mimics by Ugi Reaction Including Cyclic Hemiacetals Derived from Asymmetric Organocatalysis
作者:Alexander F. de la Torre、Daniel G. Rivera、Odette Concepción、Radell Echemendia、Arlene G. Correa、Márcio W. Paixão
DOI:10.1021/acs.joc.5b02158
日期:2016.2.5
The synthesis of novel cyclic depsipeptide mimics by means of an organocatalytic conjugate addition, leading to chiral cyclic hemiacetals, followed by a multicomponent reaction with α-amino acids and isocyanides, is described. The initial organocatalytic step is employed for the asymmetric derivatization of α,β-unsaturated aldehydes to 4,5-disubstituted 2-hydroxytetrahydropyrans, which are next used
描述了通过有机催化共轭物加成,导致手性环半缩醛,然后与α-氨基酸和异氰酸酯的多组分反应,合成了新型环状二肽肽模拟物。最初的有机催化步骤用于α,β-不饱和醛的不对称衍生为4,5-二取代的2-羟基四氢吡喃,然后将其用作Ugi五中心三组分反应中的手性双官能底物,产生9个元环内酯。通过脂肪族,二肽,糖苷和脂质异氰酸酯与几种氨基酸的结合,这种顺序方法被证明适合于快速产生分子复杂性,因此可以使用具有天然产物的酰胺,糖和脂二肽支架样的结构。