Enantioselective synthesis of 2,3-disubstituted trans-2,3-dihydrobenzofurans using a Brønsted base/thiourea bifunctional catalyst
作者:Diego-Javier Barrios Antúnez、Mark D. Greenhalgh、Charlene Fallan、Alexandra M. Z. Slawin、Andrew D. Smith
DOI:10.1039/c6ob01326k
日期:——
The diastereo- and enantioselective synthesis of 2,3-disubstituted trans-2,3-dihydrobenzofuran derivatives (15 examples, up to 96 : 4 dr, 95 : 5 er) via intramolecular Michael addition has been developed using keto–enone substrates and a bifunctional tertiary amine–thiourea catalyst. This methodology was extended to include non-activated ketone pro-nucleophiles for the synthesis of 2,3-disubstituted
2,3-二取代的反式-2,3-二氢苯并呋喃衍生物(15个例子,高达96:4 dr,95:5 er)通过分子内迈克尔加成的非对映选择性和对映选择性合成已经使用酮-烯酮底物和双功能叔胺-硫脲催化剂。该方法扩展到包括用于合成 2,3-二取代茚满和 3,4-二取代四氢呋喃衍生物的非活化酮亲核试剂。