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
Reactivity of α-Bromosulfones Obtained from<i>gem</i>-Dibromides
作者:Niels Münster、Laura Werel、Georg Alexander Rennar、Klaus Harms、Ulrich Koert
DOI:10.1002/ejoc.201501136
日期:2015.12
α-Bromosulfones have been synthesized diastereoselectively by reaction of β-hydroxy gem-dibromides with aromatic sulfinates. More steric demanding groups in the β-position led to increased stereoselectivity in these SN2 reactions. Lithiated α-bromosulfones react diastereoselectively with alkylating agents, aldehydes, and ketones. No configurational stability of the lithiated α-bromosulfones was observed