作者:V. A. Nikolaev、J. Sieler、Vs. V. Nikolaev、L. L. Rodina、B. Schulze
DOI:10.1023/a:1013117120223
日期:——
Chemistry of Diazocarbonyl Compounds: XX. Chemoselective O-Alkylation of 3(2H)-Oxoisothiazole-1,1-dioxides
作者:B. Schulze、Vs. V. Nikolaev、L. Hennig、L. L. Rodina、J. Sieler、V. A. Nikolaev
DOI:10.1023/b:rujo.0000043724.25474.51
日期:2004.5
Catalytic decomposition of diazoacetylacetone, ethyl diazoacetate, and diethyl diazomalonate effected by dirhodium tetraacetate in the presence of 3(2H)-oxoisothiazole-1,1-dioxides resulted in O-alkylation of amide carbonyl of the heterocycle affording the corresponding enol ethers in preparative yield. The reaction occurred chemoselectively. The 1,3-dicarbonyl derivatives of 3-hydroxyisothiazole1, 1 -dioxides obtained in contrast to analogous N-alkylated products are not enolized in solutions and in crystals