Diastereoselective bromine/lithium exchange reactions of 3-alkoxy-1,1-dibromo-alkanes
作者:Reinhard W. Hoffmann、Hans-Christian Stiasny、Jochen Krüger
DOI:10.1016/0040-4020(96)00260-8
日期:1996.5
The diastereoselectivity in the bromine/lithium exchangereaction on chiral 3-alkoxy-1,1-dibromo-alkanes has been investigated. The differentiation of the two diastereotopic bromine atoms was found not to depend solely on a conformational preorganisation of the substrate, as surmised previously. It became apparent that steric crowding at the δ-center controls the spatial orientation of a C-3-oxygen