cis-1,2-Bis(phenylsulphonyl)ethylene: a novel, convenient acetylene synthon in Diels–Alder reactions
Abstract
cis-1,2-Bis(phenylsulphonyl)ehtylene (5) is found to be a reactive acetylene synthon in Diels–Alder reactions since, after cycloaddition to cyclopentadiene, cyclohexadiene, and cyclohepatatriene, and reduction with sodium amalgam, the corresponding bicyclodienes(6)–(8) are obtained in good yields.