Cesium (<i>Z</i>)-2-Carbomethoxyethenethiolate: A Reagent for the Preparation of (<i>Z</i>)-2-Carbomethoxyethenyl Thioethers Including Selected Cysteine and Homocysteine Derivatives
作者:Jennifer S. O'Donnell、Suneel P. Singh、Thomas A. Metcalf、Adrian L. Schwan
DOI:10.1002/ejoc.200801025
日期:2009.2
standard and sometimes troubling conjugate addition reaction of thiols to alkyl propiolates, a new reagent, cesium (Z)-2-carbomethoxyethenethiolate, is introduced. The cesium carbonate mediated methanolysis of (Z)-2-carbomethoxyethenyl thiolacetate at low temperature creates cesium (Z)-2-carbomethoxyethenethiolate in solution. For base-insensitive and solvolytically stable electrophiles, efficient substitution
作者:L. N. Sobenina、A. P. Demenev、A. I. Mikhaleva、V. N. Elokhina、Z. V. Stepanova、A. G. Mal'kina、I. A. Ushakov、B. A. Trofimov
DOI:10.1023/a:1012438104138
日期:——
Pyrrole-1- and pyrrole-2-carbodithioates react with activated alkenes (KOH-DMSO, room temperature) along the nucleophilic addition mechanism regio- and stereospecifically to afford pyrrole-1- and pyrrole-2-carbodithioethenes. The adducts of pyrrole-2-carbodithioates under the reaction conditions undergo intramolecular cyclization into pyrrolothiazoles derivatives.