Novel Hg(OTf)(2)-Catalyzed arylene cyclization was achieved with highly efficient catalytic turnover (up to 200 times). The reaction takes place via protonation of allylic hydroxyl group by in situ formed TfOH of an organomercuric intermediate to generate a cationic species. Subsequent smooth demercuration regenerates the catalyst.
Enantioselective Organocatalytic Synthesis of Bicyclic Resorcinols
<i>via</i>
an Intramolecular Friedel−Crafts‐Type 1,4‐Addition: Access to Cannabidiol Analogues
作者:Laura A. Bryant、Kenneth Shankland、Hannah E. Straker、Callum D. Johnston、Nicholas R. Lees、Alexander J. A. Cobb
DOI:10.1002/adsc.202100647
日期:2021.8.13
report a highly enantioselective, organocatalytic intramolecular cyclization of these systems by a Friedel–Crafts-type 1,4-addition using a Jørgensen-Hayashi-like organocatalyst with a large silyl protecting group, and show that heat improves reaction yield with virtually no detriment to enantioselectivity. A variety of bicyclic resorcinols were obtained with excellent enantioselectivities (up to 94%)