Diastereoselective synthesis of α-bromoamides leading to diastereomerically enriched α-amino-, α-hydroxy- and α-thiocarboxylic acid derivatives
作者:Robert S. Ward、Andrew Pelter、Dominique Goubet、Martyn C. Pritchard
DOI:10.1016/0957-4166(94)00360-n
日期:1995.1
can be prepared diastereoselectively starting from racemic α-bromo acids, and undergo epimerisation under appropriate conditions leading to an enhanced d.e.. By reacting the individual isomers, or in some cases the mixture of diastereoisomers, with a suitable nucleophile it is possible to obtain α-substituted carboxylic acid derivatives in diastereomerically enriched form.
可以从外消旋的α-溴酸开始非对映选择性地制备衍生自冰片-10,2-舒马坦的α-溴酰胺,并在适当的条件下进行差向异构化,从而提高de。通过使单独的异构体或在某些情况下非对映异构体的混合物与合适的亲核试剂反应,可以获得非对映异构体富集形式的α-取代的羧酸衍生物。