Organocatalytic Strategies for the Construction of Optically Active Imidazoles, Oxazoles, and Thiazoles
作者:Łukasz Albrecht、Lars Krogager Ransborg、Anna Albrecht、Lennart Lykke、Karl Anker Jørgensen
DOI:10.1002/chem.201101817
日期:2011.11.18
demonstrates the first enantioselective synthesis of hydroxyalkyl‐ and aminoalkyl‐substituted imidazoles, oxazoles, and thiazoles. The approach developed utilizes a highly effective one‐pot reaction cascade that consists of either an organocatalytic epoxidation or aziridination of α,β‐unsaturated aldehydes coupled with a [3+2]‐annulation, in which amidines, ureas, or thioureas act as effective 1,3‐dinucleophilic
这项研究证明了羟烷基和氨基烷基取代的咪唑,恶唑和噻唑的首次对映选择性合成。开发的方法利用了高效的一锅法反应级联,该级联反应由有机催化环氧化或α,β-不饱和醛的叠氮化与[3 + 2]环化相结合,其中am,尿素或硫脲的作用很有效。 1,3-二亲核物种。所描述的方法学得益于催化剂用量低,可商购和容易获得的起始原料以及温和的反应条件。