Enantioselective Bromolactonization Using an<i>S</i>-Alkyl Thiocarbamate Catalyst
作者:Xiaojian Jiang、Chong Kiat Tan、Ling Zhou、Ying-Yeung Yeung
DOI:10.1002/anie.201202079
日期:2012.7.27
The apple never falls far from the tree: S‐alkyl thiocarbamate 1 (see scheme, NBP=N‐bromophthalimide) was prepared in high yield through a synthetic sequence involving a Newman–Kwart rearrangement of the corresponding O‐alkyl thiocarbamates. Compound 1 was used to catalyze bromolactonization, thus providing enantioenriched δ‐lactones in excellent yield and enantioselectivity.
苹果永远不会离树太远:通过涉及相应的O-烷基硫代氨基甲酸酯的Newman-Kwart重排的合成序列,以高收率制备了S-烷基硫代氨基甲酸酯1(参见方案,NBP = N-溴邻苯二甲酰亚胺)。化合物1用于催化溴化内酯化,从而以优异的收率和对映选择性提供了对映体富集的δ-内酯。