Palladium-Catalyzed Enantioselective Decarboxylative Allylic Alkylation of Acyclic α-<i>N</i>-Pyrrolyl/Indolyl Ketones
作者:Remi Lavernhe、Eric J. Alexy、Haiming Zhang、Brian M. Stoltz
DOI:10.1021/acs.orglett.0c01303
日期:2020.6.5
The synthesis of fully substituted α-N-pyrrolyl and indolyl ketones via enantioselectivepalladium-catalyzedallylic alkylation is described. The acyclic ketones are alkylated in high yields with high enantioselectivities through the use of an electron-deficient phosphinooxazoline ligand, furnishing a highly congested and synthetically challenging stereocenter. The obtained alkylation products contain
-carbazole, and -benzimidazole, and analogs substituted in the methylene group are converted by lithium aluminum hydride, or by Grignard reagents, or in two cases by organozinc reagents, into the N-substituted heterocycles in good yields.