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1992•Journal of the Chemical Society Perkin Transactions 1Requires access

Cycloadditions of indolizine-3-carbonitriles with dimethyl acetylenedicarboxylate: formation of [2.2.3]cyclazines and 1 : 2 adducts

Kiyoshi Matsumoto, Takane Uchida, Hiroshi Yoshida, Mitsuo Toda, Akikazu Kakehi

Open publisher page 13 citations

Abstract

Reactions of indolizine-3-carbonitriles with dimethyl acetylenedicarboxylate (DMAD), in the presence of Pd–C, gave the corresponding [2.2.3]cyclazines in low to moderate yields, whereas, in the absence of Pd–C, the same reactions afforded the 1 : 2 molar products. The X-ray analysis of one of the 1 : 2 adducts established that the structure was dimethyl 2-cyano-3-styrylpyrrole-1,4-dicarboxylate. A possible mechanism is presented.

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Reactions of indolizine-3-carbonitriles with dimethyl acetylenedicarboxylate (DMAD), in the presence of Pd–C, gave the corresponding [2.2.3]cyclazines in low to moderate yields, whereas, in the absence of Pd–C, the same reactions afforded the 1 : 2 molar products. The X-ray analysis of one of the 1 : 2 adducts established that the structure was dimethyl 2-cyano-3-styrylpyrrole-1,4-dicarboxylate. A possible mechanism is presented.

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Available abstract

Reactions of indolizine-3-carbonitriles with dimethyl acetylenedicarboxylate (DMAD), in the presence of Pd–C, gave the corresponding [2.2.3]cyclazines in low to moderate yields, whereas, in the absence of Pd–C, the same reactions afforded the 1 : 2 molar products. The X-ray analysis of one of the 1 : 2 adducts established that the structure was dimethyl 2-cyano-3-styrylpyrrole-1,4-dicarboxylate. A possible mechanism is presented.

Key concepts: Dimethyl acetylenedicarboxylate, Indolizine, Adduct, Chemistry, Medicinal chemistry, Organic chemistry, Catalysis, Cycloaddition

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