Boron tribromide as a reagent for anti-Markovnikov addition of HBr to cyclopropanes
作者:Matthew H. Gieuw、Shuming Chen、Zhihai Ke、K. N. Houk、Ying-Yeung Yeung
DOI:10.1039/d0sc02567d
日期:——
Although radical formation from a trialkylborane is well documented, the analogous reaction mode is unknown for trihaloboranes. We have discovered the generation of bromine radicals from boron tribromide and simple proton sources, such as water or tert-butanol, under open-flask conditions. Cyclopropanes bearing a variety of substituents were hydro- and deuterio-brominated to furnish anti-Markovnikov