STUDIES WITH POLYFUNCTIONALLY SUBSTITUTED HETEROAROMATICS, A NEW ROUTE TO SYNTHESIS OF THIOPYRANO[3,2-C]PYRIDINE, THIOPYRANO[4,3-B]PYRIDINE, AND BIPYRIDYL DERIVATIVES
作者:Fathi A. Abu-shanab、Mohamed R. Selim、Basil J. Wakefield、Mohamed H. Elnagdi
DOI:10.1080/10426509708033707
日期:1997.11
Abstract Pyridine derivatives (4a, d, e) were reacted with carbon disulfide in dry tetrahydrofurane (THF) in the presence of potassium tert-butoxide under Argon to yield thiopyanopyridine derivatives (7, 10). Also (2a, 4c) were reacted with carbon disulfide under the same condition producing the dithioacetal derivatives (13) which were converted to hipyridyl derivatives (14) via reaction with cyanothioacetamide
Polysubstituted pyridine derivatives were synthesized by the reaction of ketene dithioacetal, 3,3-bis(methylsulfanyl)methylenemalononitrile 1b, with a variety of active methylene compounds in the presence of either sodium hydroxide or potassium hydroxide as a base in DMSO. This reaction was carried out under economical one-pot reaction conditions (cheap catalyst and solvent) and solved the problem