Disubstituted pyrroles are prepared by cyclocondensation of aryl styryl sulfones and benzyl styryl sulfones with tosyl methyl isocyanide. Phenyl vinyl sulfone under similar conditions forms 3-benzenesulfonylpyrrole and/or 2-(2benzenesulfonylethyl)-4-benzenesulfonylpyrrole.
Novel 2‐pyrazolines were obtained by the cycloaddition of diazomethane to bis(arylsulfonylethenyl)‐sulfones (3) and 1‐arylsulfonyl‐2‐styrylsulfonylethenes (7). Dehydrogenation of 2‐pyrazolines with chloranil gave pyrazoles.
A Simple Strategy for the Synthesis of 3,4-Disubstituted Pyrroles. -3,4-disubstituted pyrroles (III) are prepared by cyclocondensation of styryl sulfones (I) with tosyl methyl isocyanide (II). Phenyl vinyl sulfone (IV) under similar conditions forms a mixture of the 3-and 2,4-disubstituted pyrroles (V) and (VI) respectively. The mechanism for the latter reaction is discussed. -(PADMAVATHI*, V.; REDDY, B. J. M.; SARMA, M. R.; THRIVENI, P.; J.
Ring closure reactions O 0130 Synthesis of Some Novel Spiro Heterocycles. -The novel spiro compounds (II) and (IV) are prepared by cyclocondensation of the gem-dicarboxylates (I) with hydrazine, hydroxylamine, urea, and thiourea. -(PADMAVATHI*, V.; REDDY, B. J. M.; PADMAJA, A.; REDDY, K. V.; SARMA, M. R.; Indian J. Chem., Sect. B: Org.
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