Oxirane rings: studies and applications of a new chemo and regio selective reductive opening of epoxides
作者:Carlo Bonini、Romano Di Fabio、Giovanni Sotgiu、Silvia Cavagnero
DOI:10.1016/s0040-4020(01)80118-6
日期:1989.1
the straightforward reductive opening of 1,2 epoxides to alcohols was studied and applied to several significant compounds. The reaction, which proceeds via the nucleophilic opening of the oxirane ring and the subsequent free radical dehalogenation, shows an excellent chemical yield as well as chemo and regioselectivity. This reaction was also applied to a chiral α,β-epoxyester.
Reaction of 2,3-epoxy-1-ol methanesulfonates with diethylaluminum chloride or with the mixture of diethylaluminum chloride and diethylamine hydrobromide in dichloromethane gave rise to regioselectively the corresponding 3-chloro- and 3-bromo-1,2-diol 1-methanesulfonates, respectively, in excellent yields.
Enantioselective routes toward 1β-methylcarbapenems from chiral aziridines
作者:David Tanner、Hua Ming He
DOI:10.1016/s0040-4020(01)89856-2
日期:1992.1
This paper describes two enantioselective aziridine-based routes toward 1β-methylthienamycin, 2, and related carbapenems, the key steps being completely regioselective ring-opening reactions of the chiral aziridines 7 and 10 with AlMe3.