Organocatalytic Enantioselective Synthesis of Tetrasubstituted α‐Amino Allenoates by Dearomative γ‐Addition of 2,3‐Disubstituted Indoles to β,γ‐Alkynyl‐α‐imino Esters
作者:Junxian Yang、Zheng Wang、Zeyuan He、Guofeng Li、Liang Hong、Wangsheng Sun、Rui Wang
DOI:10.1002/anie.201911420
日期:2020.1.7
phosphoric acid catalyzed dearomative γ-addition reaction of 2,3-disubstituted indoles to β,γ-alkynyl-α-imino esters is reported. This method provides access to a series of highly functionalized tetrasubstituted allenes featuring quaternary stereocenters in high yields, and with excellent regio-, diastereo-, and enantioselectivities under mild conditions without by-product formation. Representative large-scale
报道了通过2,3-二取代的吲哚手性磷酸催化的β-γ-炔基-α-亚氨基酯的脱芳香族γ-加成反应,首次不对称合成四取代的α-氨基脲酸酯。此方法可提供一系列具有高收率的高官能化四取代的烯,这些化合物具有四级立体中心,并且在温和条件下具有优异的区域,非对映和对映选择性,而不会形成副产物。还公开了代表性的大规模反应和产物向具有潜在生物活性的各种支架的各种转化。通过对照反应和DFT计算阐明了反应机理。