Synthesis of 2,4,5-Trisubstituted Oxazoles via Pd-Catalyzed C–H Addition to Nitriles/Cyclization Sequences
作者:Di Zhang、Hao Song、Na Cheng、Wei-Wei Liao
DOI:10.1021/acs.orglett.9b00700
日期:2019.4.19
A practical and flexible intermolecular protocol for the diverse synthesis of trisubstituted oxazole derivatives via a Pd-catalyzed direct C–H addition of electronic-rich heteroarenes to O-acyl cyanohydrins bearing an α-hydrogen/cyclization sequence is described. A wide range of trisubstituted oxazoles can be prepared from readily available starting materials in good to high yields with high efficiency
Reaction of 3-indolecarbaldehydes with a variety of acylchlorides in the presence of lithium cyanide to give 1-acyl-3-(α-acyloxy)indoleacetonitriles is described.