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Frank Jensen

Organocatalytic Asymmetric 1,6-Addition/1,4-Addition Sequence to 2,4-Dienals for the Synthesis of Chiral Chromans

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A novel asymmetric organocatalytic 1,6-addition/1,4-addition sequence to 2,4-dienals is described. Based on a 1,6-Friedel-Crafts/1,4-oxa-Michael cascade, the organocatalyst directs the reaction of hydroxyarenes with a vinylogous iminium-ion intermediate to give only one out of four possible regioisomers, thus providing optically active chromans in high yields and 94-99 % ee. Furthermore, several transformations are presented, including the formation of an optically active macrocyclic lactam. Finally, the mechanism for the novel reaction is discussed based on computational studies.

Original languageEnglish
JournalAngewandte Chemie International Edition
Pages (from-to)8203-8207
Number of pages5
Publication statusPublished - 6 Jul 2015

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