highly efficient electrophilic cyanation of boron enolates using readily available cyanating reagents, N‐cyano‐N‐phenyl‐p‐toluenesulfonamide (NCTS) and p‐toluenesulfonyl cyanide (TsCN), is reported. Various β‐ketonitriles were prepared by this new protocol, which has a remarkably broad substrate scope compared to existing methods. The present method also allowed efficient synthesis of β‐ketonitriles containing
A boron–nitrogen transborylation enabled, borane-catalysed reductive cyanation of enones
作者:Kieran Benn、Kieran Nicholson、Thomas Langer、Stephen P. Thomas
DOI:10.1039/d1cc03649a
日期:——
introduction of a nitrile group into organic molecules and an orthogonal route for the installation of a wide array of functional groups using simple transformations. Cyanation methods are dominated by transition metal catalysis and the use of hydrogen cyanide gas. Here, the electrophilic cyanation of enones was achieved using a main-group catalyst and a non-toxic, electrophilic cyanide source. This protocol
氰化提供了一种将腈基引入有机分子的简单方法,以及使用简单转化安装各种官能团的正交途径。氰化方法主要是过渡金属催化和使用氰化氢气体。在这里,烯酮的亲电氰化是使用主基催化剂和无毒的亲电氰化物源实现的。该协议适用于广泛的底物范围,包括那些含有可还原官能团的底物。机理研究表明,氨基硼烷中间体经过 B-N 转移(B -N / B- H 交换)以实现催化转化。
IBX-Mediated Dehydrogenation of Substituted β-Oxonitriles
作者:Philipp Klahn、Stefan F. Kirsch
DOI:10.1002/ejoc.201402007
日期:2014.5
convenient method for the mild dehydrogenation of β-oxonitriles is presented. When treated with o-iodoxybenzoic acid (IBX), a range of these compounds were transformed into their unsaturated counterparts. Furthermore, we show that the products of the dehydrogenation can react in situ, undergoing rapid hetero-Diels–Alder reactions with enol ethers to give multiply substituted dihydropyrans. We also describe