Pd-Catalyzed Enantio- and Regioselective Formation of Allylic Aryl Ethers
作者:Jianing Xie、Wusheng Guo、Aijie Cai、Eduardo C. Escudero-Adán、Arjan W. Kleij
DOI:10.1021/acs.orglett.7b03247
日期:2017.12.1
A general methodology for the synthesis of enantioenriched tertiary allylic aryl ethers through Pd-catalyzed decarboxylative reactions of vinyl cyclic carbonates and phenols is presented. Switching of the regioselectivity toward the formation of linear products by a judicious choice of the ligand is also reported.
A new single Pd-catalyzed decarboxylative allylation-nucleophilic cyclization relay is reported by using alpha-alkynyl arylols and vinylethylene carbonates (or vinyl carbamates), and a wide range of 3-allyl benzofurans with generally good yields were stereoselectively synthesized under mild conditions, among which the complete stereoselectivity of some cases was also observed. Notably, the present catalysts can tolerate air conditions without any ligand, additive, or base, opening new avenues to build up oxa-heterocycle frameworks through catalytic difunctionalization of internal alkynes.
David, Michele; Sauleau, Jean; Sauleau, Armelle, Canadian Journal of Chemistry, 1985, vol. 63, p. 2449 - 2454