Cyclic and acyclic sulfonimides in reactions with Rh(ii)-ketocarbenoids: a new access to chemoselective O-functionalization of the imidic carbonyl groups
diazomalonic, and diazoacetic esters using dirhodiumtetraacetate in the presence of isothiazol-3(2H)-one 1,1-dioxides and a number of N-(arenesulfonyl)carboxamides in solutions of methylene chloride or dichloroethane gives rise to O-alkylation of the imidic carbonyl groups by Rh(II)-carbenoids and the formation of O-alkylimidates as the final products. The reaction proceeds with high chemoselectivity via
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
Zur Oxidation von 1,2-Thiazolen: Ein einfacher Zugang zu 1,2-Thiazol-3(2H)-on-1,1-dioxiden
Fluorinated Diazo Diketones in Rhodium(II)-Catalyzed Reactions with Sultams: ChemoselectiveO-Functionalization of Amide Carbonyl Groups
作者:Valeria M. Zakharova、Bärbel Schulze、Ludmila L. Rodina、Joachim Sieler、Valerij A. Nikolaev
DOI:10.1002/hlca.200590146
日期:2005.7
diketones in the presence of isothiazole-3(2H)-one 1,1-dioxides offers a chemoselective and useful tool for O-functionalization of their CO groups by interaction with transient fluorine-containing RhII-diketocarbenoids. The resulting O-alkylimidates of isothiazole 1,1-dioxides, bearing (trifluoromethyl)acetyl groups, easily react with traces of H2O giving rise to stable hydrates of the perfluoroacetyl