Intramolecular Diels-Alder reactions of 1, 2, 4-triazines. A facile synthesis of thieno [2, 3-b] pyridines and 3, 4-dihydro-2H-thiopyrano [2, 3-b] pyridines
EC Taylor, JE Macor
文献索引：Taylor, Edward C.; Macor, John E. Journal of Organic Chemistry, 1987 , vol. 52, # 19 p. 4280 - 4287
Thieno [2, 3-b] pyridines and 3, 4-dihydro-2H-thiopyrano [2, 3-b] pyridines have been prepared in high overall yields via intramolecular Diels-Alder reactions of properly substituted 1, 2, 4-triazine derivatives. A one-pot synthesis of 2, 3-dihydrothieno [2, 3-b] pyridines from thiosemicarbazide is described.
