Rhodium-catalyzed α-methylthiolation reaction of unactivated ketones using 1,2-diphenyl-2-methylthio-1-ethanone for the methylthio transfer reagent
作者:Mieko Arisawa、Fumihiko Toriyama、Masahiko Yamaguchi
DOI:10.1016/j.tet.2011.01.071
日期:2011.3
RhH(PPh3)4, 1,2-bis(diphenylphosphino)ethane (dppe), and dimethyl disulfide, ketones without α-activating groups were α-methylthiolated with 1,2-diphenyl-2-methylthio-1-ethanone giving α-methylthio ketones. The reaction of unsymmetrical ketones proceeded at the more substituted carbons. The initial formation of kinetic α-methylthiolated products followed by their rearrangement to thermodynamic products was
在催化量的RhH的(PPH的存在3)4,1,2-双(二苯基膦基)乙烷(dppe),和二甲基二硫醚,没有α-活化基团进行了酮α-methylthiolated用1,2-二苯基-2-甲硫基-1-乙酮生成α-甲硫基酮。不对称酮的反应在更多取代的碳上进行。在α-苯基酮的反应中观察到了动力学α-甲基硫醇化产物的最初形成,然后重排为热力学产物。在这些条件下,醛,苯乙酸酯和苯乙腈也被α-甲基硫醇化。