Direct, Intermolecular, Enantioselective, Iridium-Catalyzed Allylation of Carbamates to Form Carbamate-Protected, Branched Allylic Amines
作者:Daniel J. Weix、Dean Marković、Mitsuhiro Ueda、John F. Hartwig
DOI:10.1021/ol901151u
日期:2009.7.2
The direct reaction between carbamates and achiral allylic carbonates to form branched, conveniently protected primary allylic amines with high regioselectivity and enantioselectivity is reported. This process occurs without base or with 0.5 equiv K3PO4 in the presence of a metalacyclic iridium catalyst containing a labile ethylene ligand. The reactions of aryl-, heteroaryl-, and alkyl-substituted
据报道,氨基甲酸酯与非手性烯丙基碳酸酯直接反应形成支化的、方便保护的伯烯丙基胺,具有高区域选择性和对映选择性。该过程在没有碱的情况下或在含有不稳定乙烯配体的金属环铱催化剂存在下使用0.5当量K 3 PO 4进行。芳基、杂芳基和烷基取代的烯丙基碳酸酯与 BocNH 2、FmocNH 2、CbzNH 2、TrocNH 2、TeocNH 2和 2-恶唑烷酮的反应收率良好,支链异构体选择性高,对映选择性高(98% 平均 ee)。