75475-94-4

Upstream product

• 75495-02-2 dimethyl 2,3,3a,4,9,9a-hexahydro-6-methyl-1,3-dioxo-2-phenyl-4,9-epithio-1H-pyrrolo<3,4-f>indolizine-7,8-dicarboxylate 
• 75495-02-2 exo-dimethyl 2,3,3a,4,9,9a-hexahydro-6-methyl-1,3-dioxo-2-phenyl-4,9-epithio-1H-pyrrolo<3,4-f>indolizine-7,8-dicarboxylate 
• 941-69-5 N-phenyl-maleimide 
• 75475-91-1 dimethyl 5-methyl-1,3-dihydropyrrolo<1,2-c>thiazole-6,7-dicarboxylate 
• 75475-92-2 dimethyl 5-methyl-1H,3H-pyrrolo<1,2-c>thiazole-6,7-dicarboxylate 2-oxide 

Relevant academic research and scientific papers

Cycloadditions to pyrrolo[1,2-c]thiazoles and pyrazolo[1,5-c]thiazoles

The pyrrolo[1,2-c]thiazole generated by dehydration of dimethyl 5-methyl-1H,3H-pyrrolo[1,2-c]thiazole-6,7-dicarboxylate 2-oxide acts as a thiocarbonyl ylide in its cycloaddition to electron deficient alkenes but as an azomethine ylide with electron deficient alkynes. The analogous pyrazolo[ 1,5-c]thiazole, generated similarly, acts as a thiocarbonyl ylide with both types of dipolarophile. This behaviour is partially explained by Frontier MO theory. (C) 2000 Elsevier Science Ltd.