In the presence of catalytic amounts of RhH(PPh3)4 and 1,2-bis(diphenylphosphino)ethane (dppe), 1,3-benzothiazoles, 1,3-benzoxazoles, and benzothiophene reacted with α-(phenylthio)isobutyrophenone giving 2-phenylthio derivatives. Reactive monocyclic heteroaromatics, 1-methyl-1,2,3,4-tetrazole and 2-cyanothiophene were also converted into the 5-phenylthio derivatives. The use of an appropriate phenylthio
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
Introduction of α-(acyl) methylthiomethyl group into the aromatic ring by Friedel-Crafts reaction
作者:Y. Tamura、H. Shindo、J. Uenishi、H. Ishibashi
DOI:10.1016/0040-4039(80)80124-9
日期:——
Friedel-Crafts α-(acyl)methylthiomethylations of aromatic compounds with α-ethoxycarbonyl, -acetyl, -benzoyl, and -cyano-α-(methylthio)methyl chlorides are described. The resulted products are easily converted to acylmethylated aromatics such as phenylacetate and phenylacetone by reductive desulfurization.
Rhodium-catalyzed synthesis of 2,3-diaryl-1,4-diketones via oxidative coupling of benzyl ketones using α-thioketone oxidizing reagent
作者:Mieko Arisawa、Guangzhe Li、Masahiko Yamaguchi
DOI:10.1016/j.tetlet.2012.12.107
日期:2013.3
no)benzene (dppBz) catalyzed the oxidativecoupling reaction of aryl benzyl ketones giving 2,3-diaryl-1,4-diketones in high yields. 3,3-Dimethyl-1-methylthio-2-butanone was used as the oxidizing reagent, which was converted to 3,3-dimethyl-2-butanone and dimethyl disulfide. Rhodium enolates were catalytically formed from ketones, which underwent oxidativecoupling using an organosulfur reagent.