Bridged 2, 2′-Biazole Derivatives by 1, 3-Dipolar Cycloaddition

…, JJ Vaquero, JLG Navío, J Alvarez-Builla

Index: De Pablo; Gandasegui; Vaquero; Garcia Navio; Alvarez-Builla Tetrahedron, 1992 , vol. 48, # 40 p. 8793 - 8800

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Citation Number: 20

Abstract

Azomethine ylides derived from 3, 4-dihydropyrrolo [1, 2-a] pyrazinium salts undergo 1, 3- dipolar cycloaddition reactions to yield 5, 6-dihydrodipyrrolo [1, 2-a: 2′, 1′-c]-pyrazine and 5, 6-dihydroimidazo [1, 2-a]-pyrrolo [2, 1-c] pyrazin-4-inium-2-olate and 2-thiolate derivatives. S-Methylation followed by nucleophilic displacement of methylthio group converted the 2-thiolate derivatives into new conjugated betaines.