Structural optimization of thiourea-based bifunctional organocatalysts for the highly enantioselective dynamic kinetic resolution of azlactones
作者:Albrecht Berkessel、Santanu Mukherjee、Thomas N. Müller、Felix Cleemann、Katrin Roland、Marc Brandenburg、Jörg-M. Neudörfl、Johann Lex
DOI:10.1039/b607574f
日期:——
describes the synthesis of a library of structurally diverse bifunctional organocatalysts bearing both a quasi-Lewis acidic (thio)urea moiety and a Bronsted basic tertiary amine group. Sequential modification of the modular catalyst structure and subsequent screening of the compounds in the alcoholytic dynamic kinetic resolution (DKR) of azlactones revealed valuable structure-activity relationships. In particular
本文介绍了结构多样的双功能有机催化剂库的合成,该催化剂同时具有准路易斯酸(硫)脲部分和布朗斯台德碱性叔胺基团。模块化催化剂结构的顺序修饰和随后的内酯内醇动力学动力学拆分(DKR)中的化合物的筛选揭示了宝贵的结构-活性关系。特别地,鉴定出“命中结构”,其以优异的对映体过量95%提供例如N-苯甲酰基-叔亮氨酸烯丙基酯。