Department of Chemistry, Zhejiang University, 20 Yugu Road, Hangzhou 310027, People's Republic of China.
Org Lett. 2010 Feb 5;12(3):640-3. doi: 10.1021/ol902961y.
3-Halopropenals 1 can behave as an alternative equivalent of beta-acylvinyl anions (I) in the presence of N-heterocyclic carbene precursor (IPr.HCl) and DBU to afford cyclic alpha,beta-unsaturated carbonyl derivatives, butenolides 4 and pyrazolone 6, after cyclization with 2 and 5, respectively.
3-卤丙烯醛 1 在 N-杂环卡宾前体(IPr.HCl)和 DBU 的存在下可以表现为β-酰基乙烯基阴离子(I)的替代等价物,分别与 2 和 5 环化后,可得到环状α,β-不饱和羰基衍生物、丁烯内酯 4 和吡唑啉酮 6。