Chiral lithium amide base-mediated rearrangement of meso-cyclohexene oxides: asymmetric synthesis of amino- and aziridinocyclohexenols
作者:Peter O'Brien、Christopher D. Pilgram
DOI:10.1039/b210608f
日期:2003.1.30
aziridinocyclohexenols of 47-68% ee were obtained. Of particular note was the smooth rearrangement of the epoxide to an allylic alcohol in the presence of an aziridine: under optimised chiral base conditions, the aziridine remained essentially unaffected. A second more straightforward strategy for introduction of an amino functionality was also investigated: (1S,4R,5S)- and (1R,4R,5S)-4,5-bis(tert-b
已经探索了两种不同的用于合成含氨基和叠氮基的环己醇的手性锂酰胺基途径。第一个策略涉及非对映选择性制备新型内消旋叠氮基环己烯氧化物及其随后使用手性碱的对映选择性重排。用这种方法,证明了二苯基膦酰基氮保护基是最佳的,并获得了47-68%ee的叠氮基环己烯醇。特别值得注意的是在氮丙啶存在的情况下环氧化物平滑重排成烯丙醇:在优化的手性碱条件下,氮丙啶基本不受影响。还研究了引入氨基官能团的第二种更直接的策略:(1S,4R,5S)-和(1R,4R,5S)-4,5-双(叔丁基二甲基甲硅烷氧基)环己-2-烯醇,