One-Step Synthesis of 3-Aryl- and 3,4-Diaryl-(1<i>H</i>)-Pyrroles Using Tosylmethyl Isocyanide (TOSMIC)
作者:Nicholas D. Smith、Dehua Huang、Nicholas D. P. Cosford
DOI:10.1021/ol0267073
日期:2002.10.1
[GRAPHICS]A one-step synthesis of 3-aryl and 3,4-diaryl-(1H)-pyrroles from TOSMIC and commercially available or readily synthesized arylalkenes is reported. Optimal conditions were found to be NaOtBu in DMSO. The methodology was particularly efficient (yields > 65%) when electron poor aryl groups were attached to the alkene.
SAKAI KAZUO; SUZUKI MAMORU; NUNAMI KEN-ICHI; YONEDA NAOTO; ONODA YUICHI; +, CHEM. AND PHARM. BULL., 1980, 28, NO 8, 2384-2393
Various dimethyl 3-substituted pyrrole-2, 4-dicarboxylates (3) were synthesized by the reaction of methyl isocyanoacetate (2) with methyl α-isocyanoacrylates (5) in the presence of base. This type of reaction was also applicable to the preparation of 3-substituted pyrrole-2, 4-dicarboxamides (10) by employing appropriate amide compounds (8) or (9) and (12) as reactants. Hydrolysis followed by decarboxylation of the pyrrole diester compounds (3) gave 3-substituted pyrroles (14) in good yields. A series of these compounds (14) showed antiinflammatory activities against carrageenan-induced rat paw edema. Among the compounds tested, 3-(2-chlorophenyl) pyrrole (14d) was found to be more potent than mefenamic acid.