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One-pot Synthesis of 1,6-Naphthyridines, Pyranopyridines and Thiopyranopyridines
2008
Zeitschrift für Naturforschung. B, A journal of chemical sciences
A one-step synthesis of [1,6]naphthyridine-2(1H)-thione (3a), pyrano[3,4-b]pyridine-2(1H)- thione (3b), thiopyrano[3,4-b]pyridine-2(1H)-thione (3c) and 6-oxoquinoline-2(1H)-thione (3d) through the reaction of benzylidene-cyanothioacetamide (1) with cyclic ketones 2a−d is described. The reaction of 3a−d with organyl chlorides yielded the 2-alkylthio-3-cyanopyridines 4a−p which upon refluxing in ethanolic sodium ethoxide afforded the thieno[2,3-b]pyridine derivatives 5a−n. Some of the synthesized
doi:10.1515/znb-2008-0314
fatcat:6or6g2q3x5corppxi2z6lenjd4