Asymmetric Synthesis of 4-Aryl-3,4-dihydrocoumarins by <i>N</i>-Heterocyclic Carbene Catalyzed Annulation of Phenols with Enals
作者:Guo-Tai Li、Zhi-Ke Li、Qing Gu、Shu-Li You
DOI:10.1021/acs.orglett.7b00088
日期:2017.3.17
enantioselective synthesis of 4-aryl-3,4-dihydrocoumarins was realized through direct annulation of phenols with enalscatalyzed by dihydroisoquinoline-type NHC (DHIQ-NHC), an N-heterocycliccarbene derived from l-phenylalanine. The catalytic reaction proceeds with a wide scope of electron-rich phenols and enals providing structurally diverse 4-aryl-3,4-dihydrocoumarins in good to excellent yields