Reactivity of α-trifluoromethanesulfonyl esters, amides and ketones: Decarboxylative allylation, methylation, and enol formation
作者:Han Il Kong、Monica A. Gill、Amy H. Hrdina、Jennifer E. Crichton、Jeffrey M. Manthorpe
DOI:10.1016/j.jfluchem.2013.03.020
日期:2013.9
α-Trifluoromethylsulfonyl esters, ketones, and amides were all methylated in the presence of trimethylsilyldiazomethane. Esters afforded a mixture of O- and C-methylation; however, ketones and amides offered exclusively O-methylation, with varying degrees of E/Z selectivity, thus affording ambiphilic alkenes. α-Trifluoromethanesulfonyl ketones also exhibited keto-enol tautomerism.
报道了α-三氟甲磺酰基对各种羰基化学性质的影响。烯丙基α,α-二烷基化-α-三氟甲磺酰基酯易于进行脱羧烯丙基化。在三甲基甲硅烷基重氮甲烷存在下,α-三氟甲基磺酰基酯,酮和酰胺都被甲基化。酯提供了O-和C-甲基化的混合物。但是,酮和酰胺仅提供O-甲基化,具有不同程度的E / Z选择性,因此提供了两亲性烯烃。α-三氟甲磺酰基酮也表现出酮-烯醇互变异构现象。