Efficient direct asymmetric vinylogous Michael addition reactions of γ-butenolides to chalcones catalyzed by vicinal primary-diamine salts
作者:Junfeng Wang、Chao Qi、Zemei Ge、Tieming Cheng、Runtao Li
DOI:10.1039/b923925a
日期:——
The first direct organocatalytic asymmetric vinylogous Michael addition reactions of gamma-butenolides to chalcones have been developed by using chiral 1,2-diaminocyclohexane as a novel organocatalyst via a di-iminium transition state to provide syn-Michael products with good yields, high diastereoselectivities and enantioselectivities (up to 78% yield, >99 : 1 dr and 96% ee).
通过使用手性的1,2-二氨基环己烷作为新型有机催化剂,通过二亚胺基过渡态,开发了γ-丁烯内酯与查耳酮的第一个直接有机催化不对称乙烯基乙烯基迈克尔加成反应,以提供具有高收率,高非对映选择性和对映选择性(产率高达78%,> 99:1 dr和96%ee)。