Effective Formylation of Amines with Carbon Dioxide and Diphenylsilane Catalyzed by Chelating bis(<i>tz</i>NHC) Rhodium Complexes
作者:Thanh V. Q. Nguyen、Woo-Jin Yoo、Shū Kobayashi
DOI:10.1002/anie.201504072
日期:2015.8.3
(NHC=N‐heterocyclic carbene) have been synthesized and applied to the reductive formylation of amines using CO2 and Ph2SiH2. A rhodium‐based bis(tzNHC) complex (tz=1,2,3‐triazol‐5‐ylidene) was identified to be highly effective at a low catalyst loading and ambient temperature, and a wide substrate scope, including amines with reducible functional groups, were compatible.
使用CO 2和氢硅烷对胺进行还原甲酰化是将CO 2引入有价值的有机化合物中的一种有吸引力的方法。然而,先前的系统需要高催化剂负载量或高温才能达到高效率,并且底物范围主要限于简单的胺。为了解决这些问题,已经合成了一系列烷基桥连的螯合双(NHC)铑配合物(NHC = N-杂环卡宾),并将其用于使用CO 2和Ph 2 SiH 2还原胺的甲酰化反应。铑基双(tz NHC)络合物(tz1,2,3-三唑-5亚基)在较低的催化剂负载量和环境温度下被认为是高效的,并且兼容广泛的底物范围,包括具有可还原官能团的胺。