An efficient microwave-assisted solvent-free synthesis of pyrido-fused ring systems applying the tert-amino effect
摘要:
Significant improvements in the synthesis of pyrido-fused heterocycles were observed when performing the reaction under solvent-free conditions, applying the tert-amino effect as the key ring closure methodology. An unexpected cyclization of ortho-(1'-azacycloalkyl)benzaldehydes has been studied in water and on solid support. (c) 2005 Elsevier Ltd. All rights reserved.
Imidazol-5-ones as a substrate for [1,5]-hydride shift triggered cyclization
作者:Elvira R. Zaitseva、Alexander Yu. Smirnov、Ivan N. Myasnyanko、Konstantin S. Mineev、Anatolii I. Sokolov、Tatyana N. Volkhina、Andrey A. Mikhaylov、Nadezhda S. Baleeva、Mikhail S. Baranov
DOI:10.1039/d0nj05738j
日期:——
2-Dialkylamino-arylidene-imidazolones undergo intermolecular tandem [1,5]-hydride shift and cyclization to form spirocyclic tetrahydroquinoline derivatives under TiCl4 promotion. Different substitutions on each of the aryl, amino and imidazole fragments are tolerated, which results in 20+ examples and 25–95% yields.