与异恶唑合成;异恶唑并[2,3- a ]吡啶鎓盐的生产以及异恶唑-3-羧酸盐向恶唑-2-羧酸盐的光化学转化
摘要:
3-(4-乙氧基丁酰基)异恶唑(6)的环化得到4,5,6,7-四氢-4-氧代异恶唑并[2,3- a ]溴化吡啶鎓(7)。尝试用沸腾的乙酸酐对酮(7)进行芳构化未成功,但是溴化反应生成了二溴代酮(9),将其脱氢溴化为5-溴代-4-羟基异恶唑并[2,3- a ]溴化吡啶鎓(10)。 。描述了异恶唑-3-羧酸盐到相应的恶唑-2-羧酸盐的光化学转化。
Carboxylation of C−H Bonds Using <i>N</i>-Heterocyclic Carbene Gold(I) Complexes
作者:Ine I. F. Boogaerts、Steven P. Nolan
DOI:10.1021/ja103429q
日期:2010.7.7
A highly efficient [(NHC)Au(I)]-based (NHC = N-heterocyclic carbene) catalytic system for the carboxylation of aromatic and heteroaromatic C-H bonds was developed. The significant base strength of the Au-OH species is at the origin of the activation process and permits the facile functionalization of C-H bonds without the use of other organometallic reagents.