The α-halogenation of α,β-unsaturated carbonyls and dihalogenation of alkenes using bisacetoxyiodobenzene/pyridine hydrohalides
作者:Marsewi Ngatimin、Christopher J. Gartshore、Jeremy P. Kindler、Sudha Naidu、David W. Lupton
DOI:10.1016/j.tetlet.2009.08.038
日期:2009.11
A procedure for the α-chlorination or bromination of a number of α,β-unsaturated carbonyls, and the dichlorination or bromination of alkenes, is developed using bisacetoxyiodobenzene (BAIB) and the HCl or HBr salt of pyridine. The reaction proceeds in an acceptable to a good yield and has a broad substrate scope. The dibromination is also achieved using a chiral I[V] reagent, although little enantioselectivity
使用双乙酰氧基碘苯(BAIB)和吡啶的HCl或HBr盐开发了多种α,β-不饱和羰基的α-氯化或溴化方法,以及烯烃的二氯化或溴化方法。反应以可接受的产率进行,并具有良好的收率,并且具有广泛的底物范围。尽管可以实现很少的对映选择性,但是也可以使用手性I [V]试剂实现二溴化。