Triazolopyridines. 19. Synthesis and reactions of ylides derived from [1,2,3]triazolo[1,5-a]quinoline and [1,2,3]triazolo[5,1-a]isoquinoline with methyl propiolate

Abstract Preparation and structure of salts and ylides derived from triazolo[1,5- a ]quinoline 2 and triazolo[5,1- a ]isoquinoline 3 are described. Reactions with methyl propiolate of ylides 6–9 give pyrrolo[1,2- a ]quinolines 13,18 and pyrrolo[2,1- a ]isoquinolines 12, 19 .

The reaction betweentriazolobenzopyridinium and triazolothiazolium ylides with dimethyl acetylenedicarboxylate

Abstract The reaction of some [1,2,3]triazolo[1,5- a ]quinolinium 1,2 , [1,2,3]triazolo[5,1- a ]isoquinolinium 3,4 and [1,2,3]triazolo[5,1- b ]thiazolium 5,6 ylides with dimethyl acetylenedicarboxylate is described. Compounds as dimethyl pyrrolo[1,2- a ]quinoline-1,2-dicarboxylate 19 , dimethyl pyrrolo[2,1- a ]isoquinoline-2,3-dicarboxylate 20 , 1,1-dicyano-2,3-dimethoxycarbonyl-1 H -pyrido[1,2- a ]quinoline 24 , 4,4-dicyano-2,3-dimethoxycarbonyl-4 H -pyrido[2,1- a ]isoquinoline 25 , and 7-methyl-5,6-dimethoxy-carbonylpyrrolo[2,1- a ]thiazole 14b , are formed.

Photochemistry of triazolopyridinium ylides