Spiro-fused Tricyclic 7,8,9,10-Tetrahydro-3H,5H-benzo[d]pyrrolo[1,2-c][1,2,3]triazoles and their Thermal Rearrangement to 1,3,4-Trisubstituted 2-(4-Cyanobutyl)pyrroles. Azolium 1,3-Dipoles†
Abstract
New substituted tricyclic 7,8,9,10-tetrahydro-3H-5,H-benzo[d]pyrrolo[1,2-c][1,2,3]triazoles 4 and 5 rearrange on heating to afford high yields of 1-arylamino-2-(4-cyanobutyl)-3,4-bis(alkoxycarbonyl)pyrroles 6 and 7.