Highly enantioselective access to diketopiperazines via cinchona alkaloid catalyzed Michael additions
作者:Alejandro Cabanillas、Christopher D. Davies、Louise Male、Nigel S. Simpkins
DOI:10.1039/c4sc03218g
日期:——
Michael addition reactions of triketopiperazine (TKP) derivatives to enones, mediated by a cinchona alkaloid-derived catalyst, deliver products in high yield and enantiomeric ratio (er). Use of unsaturated ester, nitrile or sulfone partners gives bridged hydroxy-diketopiperazine (DKP) products resulting from a novel Michael addition–ring closure.
三酮哌嗪 (TKP) 衍生物与烯酮的迈克尔加成反应,由金鸡纳生物碱衍生催化剂介导,以高产率和对映体比 (er) 提供产品。使用不饱和酯、腈或砜配合物可产生由新型迈克尔加成环闭合产生的桥接羟基-二酮哌嗪 (DKP) 产品。