作者:Matt R. Adams、Chieh-Hung Tien、Robert McDonald、Alexander W. H. Speed
DOI:10.1002/anie.201709926
日期:2017.12.22
first use of diazaphospholenes as chiral catalysts has been demonstrated with enantioselective imine hydroboration. A chiral diazaphospholene prepared in a simple three‐step synthesis from commercial materials has been shown to achieve the highest enantioselectivity for the hydroboration of alkyl imines with pinacolborane reported to date. Enantiomer ratios of up to 88:12 were obtained with low (2 mol %)
对映选择性亚胺氢硼化已证明了二氮杂膦烯作为手性催化剂的首次使用。已证明,由市售材料通过简单的三步合成方法制备的手性二氮杂ol烯具有最高的对映选择性,迄今为止,据报道该化合物与频哪醇硼烷一起对烷基亚胺进行硼氢化。在低(2 mol%)催化剂负载下,可获得高达88:12的对映体比例。显示了使用这种主要基团催化方案进行不对称还原的20个实例,包括药物对雷沙吉兰和芬迪林的合成。