A Practical Protocol for Three-Component, One-Pot, Stepwise Sonogashira-Heterocyclization-Heck Couplings
作者:Rosana Alvarez、José Aurrecoechea、Youssef Madich、J. Denis、Aitor Ortega、Claudio Martínez、Abdellatif Matrane、Larbi Belachemi、Angel de Lera
DOI:10.1055/s-0033-1338873
日期:——
A three-component, one-pot, stepwise Sonogashira-heterocyclization-Heck-coupling process was developed starting from either haloarenecarboxamides, halophenols or haloanilines, terminal alkynes and electron-deficient alkenes. Cyclic imidate-, benzofuran-, or indole-type products are obtained, respectively, in useful yields, being typically better than those obtained with isolation of the intermediate Sonogashira adducts. Very high 6-endo selectivity is maintained with imidate-type coupling products despite the presence of copper salts carried over from the Sonogashira coupling.