Benzotriazolyl-Mediated 1,2-Shifts of Electron-Rich Heterocycles
作者:Alan R. Katritzky、Sergey Bobrov、Niveen Khashab、Kostyantyn Kirichenko
DOI:10.1021/jo049931+
日期:2004.6.1
The anion formed from the lithiation of 1-[(methylthio)methyl]-1H-benzotriazole 1 with n-BuLi adds to heteroaryl ketones to give 2-benzotriazolyl alcohols 3a−m. Thermolysis of 3a−g in the presence of zinc bromide induces a 1,2-shift of heteroaromatic groups to form ketones 4a−g. By contrast, in the rearrangement of 2-benzotriazolyl alcohols 3h,i,k−m migration of the phenyl group rather than the corresponding