Direct Prenylation of Aromatic and α,β-Unsaturated Carboxamides via Iridium-Catalyzed C−H Oxidative Addition−Allene Insertion
摘要:
Exposure of aromatic carboxamides 1e-1m, heteroaromatic carboxamides in-1p, and alpha,beta-unsaturated carboxamides 1q-1s to 1,1-dimethylallene in the presence of the a cationic iridium complex derived from [Ir(cod)(2)]BAr4F and rac-BINAP results in direct C-H prenylation to furnish adducts 2e-2m, 2n-2p, and 2q-2s, respectively, in good isolated yields as single isomers.
One-Pot, Telescoped Alkenylation of Amides via Stable Tetrahedral Intermediates as Lithium Enolate Precursors
作者:Simone Ghinato、Carolina Meazzo、Federica De Nardi、Andrea Maranzana、Marco Blangetti、Cristina Prandi
DOI:10.1021/acs.orglett.3c01269
日期:2023.6.2
A mild and efficient telescoped procedure for the stereoselectivealkenylation of simple, non-activated amides using LiCH2SiMe3 and carbonyl compounds as surrogates of alkenyllithium reagents is reported. Our methodology relies on the formation of stable tetrahedral intermediates, which, upon collapse into highly reactive lithium enolates in a solvent-dependent fashion, allows for the assembly of α