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Pyrrole, 1-methyl-2,3,5-tris synthesis

Pyrroles.—Formation. A general synthesis of 2-aryl-pyrroles (112) is by cycliz-ation of the esters (111), which are obtained from unsaturated aldehydes and methyl azidoacetate. Thermolysis of the acetylene (113 Ar = p-MeC6H4) gives Al-(p-tolyl)pyrrole with the elimination of p-thiocresol. The pyrrole derivative (115) is the product of the action of benzylamine on tri-(t-butylthio)cyclopropenylium perchlorate (114). Azoalkenes combine with fi-dicarbonyl compounds or with enamines to yield derivatives of Al-aminopyrrole thus the ester (116) and ethyl acetoacetate form (117). The base-catalysed addition of methyl propiolate to toluene-p-sulphonylmethyl isocyanide, T0SCH2NC, gives the ester (118). The dipolar cyclo-adduct (120) of piperidinocyclopentene to the azo-compound (119) forms the A-(tosyl-amino)pyrrole derivative (121) and piperidine on heating. ... [Pg.156]

See other pages where Pyrrole, 1-methyl-2,3,5-tris synthesis is mentioned: [Pg.817]    [Pg.817]    [Pg.817]    [Pg.874]    [Pg.874]    [Pg.817]    [Pg.874]    [Pg.661]    [Pg.503]    [Pg.179]    [Pg.1098]    [Pg.17]    [Pg.547]    [Pg.547]    [Pg.1098]    [Pg.407]    [Pg.547]    [Pg.3]    [Pg.27]    [Pg.274]    [Pg.10]    [Pg.10]   


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