Catalytic Ugi-Type Condensation of α-Isocyanoacetamide and Chiral Cyclic Imine: Access to Asymmetric Construction of Several Heterocycles
作者:Liang Xia、Sheng Li、Ruijiao Chen、Kai Liu、Xiaochuan Chen
DOI:10.1021/jo4000702
日期:2013.4.5
Several novel heterocycles have been constructed asymmetrically on the basis of a catalytic Ugi-type condensation of α-isocyanoacetamide and chiral cyclic imine. The combination of phenylphosphilic acid and trifluoroethanol is exploited to promote an Ugi-type reaction with α-isocyanoacetamide for the first time. By means of this reaction, chiral 3-oxazolyl morpholin-2-one/piperazin-2-one derivatives
在α-异氰基乙酰胺和手性环状亚胺的催化Ugi型缩合的基础上,已经不对称地构建了几种新的杂环。首次利用苯基磷酸和三氟乙醇的组合促进与α-异氰基乙酰胺的Ugi型反应。通过该反应,以高收率和优异的立体选择性合成手性的3-恶唑基吗啉-2-酮/哌嗪-2-酮衍生物。作为富电子的氮杂二烯,这些缩合产物通过适当的亲二烯体如马来酸酐和不饱和酰氯经多米诺法处理而进一步转化为稠合的三环骨架。而且,由异氰基乙酰胺,亚胺和马来酸酐一锅三组分合成手性三环骨架也是可行的。