1-[2-(Methylsulfanyl)phenyl]prop-2-en-1-one reacted with ketones, α-diketones, and α-keto esters in the presence of BF3·Et2O to give MoritaâBaylisâHillman adducts.
Reactions of 2-(methylchalcogeno)phenylvinylketones 1 and 4 with aldehydes 5 were conducted in the presence of BF3·Et2O. The reaction was quenched by addition of Et3N and gave the Morita−Baylis−Hillman adducts 6−7 in good yields. When the reaction mixture of 1 with 5a was worked up with saturated aqueous NaHCO3, the sulfonium salt 8a was obtained together with 6. Ketones 10, α-diketones, and α-oxo
The tandemMichael-aldolreaction of 1-[2-(methylsulfanyl)-phenyl]prop-2-en-1-one (1) or the seleno congener 4 with p-nitrobenzaldehyde in the presence of BF3.Et2O gave the Baylis-Hillman adduct 2 or 5 and onium salt 3 or 6, respectively, and selenochromanone 7 from 4.
Generation and reaction of alanyl radicals in open flasks
作者:Elene Tatunashvili、Callan J. Maloney、Bun Chan、Christopher S. P. McErlean
DOI:10.1039/d2cc06211a
日期:——
The generation and Giese-type reaction of alanyl radicals under metal-free reaction conditions is described. The procedure is operationally simple, occurring at ambient temperature in an open reaction vessel, and requiring short reaction times (≤5 min). The reaction occurs without epimerization and provides ready access to non-proteinogenic amino acids and peptides. Importantly, the process is tolerant