Enantioselective organocatalytic Michael reactions using chiral (<i>R</i>,<i>R</i>)-1,2-diphenylethylenediamine-derived thioureas
作者:Jae Ho Shim、Min Ji Lee、Min Ho Lee、Byeong-Seon Kim、Deok-Chan Ha
DOI:10.1039/d0ra03550e
日期:——
Although the Michael addition is a very well-known and widely applied reaction, cost-effective, metal-free, and readily prepared organic catalysts remain rare. A chiral, bifunctional, (R,R)-1,2-diphenylethylenediamine-derived thiourea organic catalyst was developed and applied to asymmetric Michael additions of nitroalkenes under neutral conditions. Generally, fluorine-substituted thiourea catalysts
尽管迈克尔加成反应是一种众所周知且应用广泛的反应,但具有成本效益、不含金属且易于制备的有机催化剂仍然很少见。开发了一种手性、双功能、( R , R )-1,2-二苯基乙二胺衍生的硫脲有机催化剂,并将其应用于中性条件下硝基烯烃的不对称迈克尔加成。通常,氟取代的硫脲催化剂在中性条件下表现出高化学产率和对映选择性。温和的反应对许多官能团具有耐受性,并提供了良好的产率,以及迈克尔加合物的高非对映和对映选择性。通过合成生物活性化合物 ( R )-Phenibut 证明了转化的效用。
Hexafluorobenzene: a powerful solvent for a noncovalent stereoselective organocatalytic Michael addition reaction
作者:Alessandra Lattanzi、Claudia De Fusco、Alessio Russo、Albert Poater、Luigi Cavallo
DOI:10.1039/c2cc17488j
日期:——
A dramatic enhancement of the diastereo- and enantioselectivity in the nitro-Michaeladdition reaction organocatalysed by a commercially available alpha,alpha-L-diaryl prolinol was disclosed when performing the reaction in unconventional hexafluorobenzene as a medium. DFT calculations were performed to clarify the origin of stereoselectivity and the role of C(6)F(6).