Enantioselective Syntheses of Tricyclic Benzimidazoles via Intramolecular Allylic Aminations with Chiral-Bridged Biphenyl Phosphoramidite Ligands
作者:Xiaoding Jiang、Xiangmeng Chen、Yongsu Li、Hao Liang、Yaqi Zhang、Xiaobo He、Bin Chen、Wesley Ting Kwok Chan、Albert S. C. Chan、Liqin Qiu
DOI:10.1021/acs.orglett.8b03640
日期:2019.2.1
The first iridium-catalyzed enantioselective intramolecular allylic aminations of benzimidazole-tethered allylic carbonates were developed, providing three classes of tricyclic benzimidazoles bearing a tertiary carbon stereogenic center in high yields and excellent enantioselectivities (up to 99% yield, 99% ee). Wide substrate scope, excellent catalytic efficiency and mild conditions rendered this
开发了首批铱催化的苯并咪唑系留的碳酸烯丙酯的对映选择性分子内烯丙基胺化反应,提供了三类三环苯并咪唑,它们具有叔碳立构中心,具有高收率和优异的对映选择性(高达99%,99%ee)。广泛的底物范围,出色的催化效率和温和条件使该方案特别优越和实用。令人印象深刻的是,具有可调结构的手性桥被证明为手性环境提供了很好的调节空间。在这些转化中,配体的优异催化性能表现出了优于基于双酚和BINOL的对应物的优势。它还强调了手性桥联配体的潜在应用价值。