The first catalytic, enantioselectivevinylogousMannichreaction of acyclic silyl dienolates is reported. A second‐generation 2,2′‐dihydroxy‐1,1′‐binaphthyl (BINOL)‐based phosphoric acid has been developed and further optimized as an enantioselective organocatalyst. Upon protonation of the imines, chiral contact ion pairs are generated in situ and attacked highly diastereoselectively by the nucleophile
Mohamed Kassim; Basheer Ahamed, Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1999, vol. 38, # 6, p. 533 - 540
作者:Mohamed Kassim、Basheer Ahamed
DOI:——
日期:——
Brønsted Acid-Catalyzed, Enantioselective, Vinylogous Mannich Reaction of Vinylketene Silyl <i>N</i>,<i>O</i>-Acetals
作者:David S. Giera、Marcel Sickert、Christoph Schneider
DOI:10.1021/ol8017374
日期:2008.10.2
Vinylketene silyl N,O-acetals undergo chiral phosphoric acid-catalyzed, vinylogous Mukaiyama-Mannich reactions with imines and afford delta-amino-alpha,beta-unsaturated amides in typically good yields, complete gamma-regioselectivity, and up to 92% ee with catalyst loadings of as low as 1 mol %. The Mannich products can be readily manipulated to furnish valuable synthetic intermediates.