Reaction of Dicarbomethoxycarbene with Thiophene Derivatives
作者:William S. Jenks、Melanie J. Heying、Stacey A. Stoffregen、Erin M. Rockafellow
DOI:10.1021/jo802823s
日期:2009.4.3
Photolysis of derivatives of dimethylmalonate thiophene-S,C-ylide provides dicarbomethoxycarbene, which can react with thiophene to form dimethyl (2-thienyl)malonate. By generation of dicarbomethoxycarbene from the dibenzothiophene-based ylide in neat thiophene, it is shown that the thienylmalonate is not a product of rearrangement of the thiophene ylide, in contrast to thermolysis results. Formation
<i>S,C</i>-Sulfonium Ylides from Thiophenes: Potential Carbene Precursors
作者:Stacey A. Stoffregen、Melanie Heying、William S. Jenks
DOI:10.1021/ja076351w
日期:2007.12.1
Photolysis of S,C-sulfonium ylides derived from thioanisol, thiophene, benzothiophene, or dibenzothiophene provides products deriving from dicarbomethoxycarbene. In methanol, no rearrangement of the carbene to the ketene derivative is observed. Formation of dibenzothiophene and benzothiophene is quantitative. For the thiophene-based ylide, insertion of the carbene into the alpha-CH bond of thiophene