描述了一种新颖、简单且无金属的串联方法,通过酸催化环氧化物重排和有机催化羟醛缩合过程合成α-取代( E )-α,β-不饱和醛衍生物。该转化在温和条件下具有广泛的底物范围,包括含有不同官能团的环氧化物和醛,从而产生中等到高产率的所需产物。最终,大规模反应和一些生物活性分子的合成被用来证明所开发方法的潜在适用性。
allylic C−C σ‐bond cleavage of simple olefins to give valuable cinnamyl aldehydes is reported. 1,2‐Aryl or alkyl migration through allylic C−C bond cleavage occurs in this transformation, which is assisted by an alkyl azide reagent. This method enables O‐atom incorporation into simple unfunctionalized olefins to construct cinnamyl aldehydes. The reaction features simple hydrocarbon substrates, metal‐free
Ruthenium-Catalyzed Aldehyde Functionality Reshuffle: Selective Synthesis of <i>E</i>-2-Arylcinnamaldehydes from <i>E-</i>β-Bromostyrenes and Aryl Aldehydes
作者:Ping Wang、Honghua Rao、Feng Zhou、Ruimao Hua、Chao-Jun Li
DOI:10.1021/ja306025d
日期:2012.10.10
A new concept for highly selective synthesis of E-2-arylcinnamaldehydes has been developed via a formal arylformylation of E-beta-bromostyrenes with readily available aryl aldehydes. This strategy involves an overall reshuffle of the aldehyde functionality with a loss of hydrogen bromide.