Catalytic Asymmetric Aminohydroxylation (AA) of Olefins

作者：Guigen Li, Han‐Ting Chang, Karl Barry Sharpless · 发表于：Angewandte Chemie International Edition in English · 年份：1996 · DOI：10.1002/anie.199604511 · 被引用次数：692 · 研究领域：Asymmetric Synthesis and Catalysis、Asymmetric Hydrogenation and Catalysis、Chemical Synthesis and Analysis

The stereospecific cis addition of “TsN” and H2O yields α-hydroxy-N-tosylamines (see below). This osmium-catalyzed process, which depends on Chloramine-T as the nitrenoid source, is rendered asymmetric in the presence of cinchona alkaloid ligands. The selectivities for reactions of the six olefins studied range from 33% ee (cis-stilbene) to 81% ee (trans-methylcinnamate). The active agent is presumably the compound Os(O)3NTs shown in square brackets. (DHQ)2-PHAL = bis(dihydro-quininyl)phthalazine (see preceding communication).