A Continuously Regenerable Chiral Ammonia Borane for Asymmetric Transfer Hydrogenations
作者:Qiwen Zhou、Wei Meng、Jing Yang、Haifeng Du
DOI:10.1002/anie.201806877
日期:2018.9.10
A novel chiral ammonia borane was designed and developed through the dehydrogenation of ammonia borane with a chiral phosphoric acid, which was highly effective for the asymmetric transfer hydrogenation of imines and β‐enamino esters to afford high levels of reactivities and enantioselectivities. Significantly, this chiral ammonia borane can be continuously regenerated during the transfer hydrogenation
通过用手性磷酸对硼烷进行脱氢,设计和开发了一种新型的手性硼烷,它对于亚胺和β-烯氨基酯的不对称转移氢化非常有效,可提供高水平的反应性和对映选择性。值得注意的是,该手性氨硼烷可以在转移氢化过程中借助水和氨硼烷连续再生,这使得仅使用0.1摩尔%的手性磷酸就可以获得令人满意的结果。值得注意的是,手性磷酸的作用是产生手性氨硼烷。