Enantioselective direct Mannich-type reactions of 2-benzylpyridine N-oxides catalyzed by chiral bis(guanidino)iminophosphorane organosuperbase
作者:Qiupeng Hu、Azusa Kondoh、Masahiro Terada
DOI:10.1039/c8sc00808f
日期:——
pronucleophiles for the first time in enantioselective addition reactions under Brønsted base catalysis. A chiral bis(guanidino)iminophosphorane was able to overcome the inherent issue of low acidity of the pronucleophiles, establishing the diastereo- and enantioselective direct Mannich-type reaction with N-Boc imines. The control experiments indicated that the N-oxide moiety of the substrates played
在布朗斯台德碱催化下的对映选择性加成反应中,具有较低酸性α-质子的2-苄基吡啶N-氧化物首次被用作亲核试剂。手性双(胍基)亚氨基正膦能够克服亲核试剂低酸度的固有问题,与N - Boc亚胺建立了非对映和对映选择性的直接曼尼希型反应。对照实验表明,底物的N-氧化物部分在实现高立体选择性中起关键作用。