Preparation of Enantiomerically Pure Perfluorobutanesulfinamide and Its Application to the Asymmetric Synthesis of α-Amino Acids
作者:Apiwat Wangweerawong、Joshua R. Hummel、Robert G. Bergman、Jonathan A. Ellman
DOI:10.1021/acs.joc.5b02700
日期:2016.2.19
A high yielding and practical two-step synthesis of enantiomerically pure perfluorobutanesulfinamide from Senanayake’s 2-aminoindanol-derived sulfinyl transfer reagent was developed and carried out on a multigram scale. Straightforward condensation of this sulfinamide with ethyl glyoxylate provided the N-perfluorobutanesulfinyl imino ester. The utility of this activated N-sulfinyl imino ester was demonstrated
从Senanayake的2-氨基茚满醇衍生的亚磺酰基转移试剂开发了高产且实用的两步合成对映体纯的全氟丁烷亚磺酰胺,并已进行了多克规模的合成。该亚磺酰胺与乙醛酸乙酯的直接缩合得到N-全氟丁烷亚磺酰基亚氨基酯。这样做的效用激活ñ -亚磺酰基亚氨基酯证明了这给了或者没有产品或非常低的产率与相应的较少电反应ñ -叔-butanesulfinyl衍生物。特别是,Rh(III)催化的芳族化合物的C–H键加成至N-全氟丁烷亚磺酰基亚氨基酯为包括吡咯烷酰胺,偶氮,亚磺酰亚胺,1-吡唑和1,2,3-三唑官能团在内的一系列导向基团提供了非常高的非对映选择性的芳基甘氨酸。热不对称氮杂狄尔斯-阿尔德反应进行也以良好的收率和高选择性,包括用于取代的二烯(ê)-1,3-戊二烯和(2 ë,4 ê)-2,4-己二烯。