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Paper | Regular issue | Vol 48, No. 4, 1998, pp.711-734
Published online, 1st January, 1970
DOI: 10.3987/COM-98-8105
Pyrylium Salts of γ-Thiapyrones --- A Simple Step to Phosphono-phosphino Substituted Pyridines and Pyridinium Salts

Richard Neidlein* and Dirk Uwe Hahn

*Pharmazeutisch-Chemishces Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 364, D-69120 Heidelberg, Germany


The phosphono-phoshino substituted γ-thiapyrones (1/2) are converted to pyrylium salts (3/4) with trimethyloxonium tetrafluoroborate (5) under mild conditions. Reaction of the pyrylium salts (3/4) with ammonia and primary amines (10) lead to phosphono-phoshino pyridines (6/7) and pyridinium salts (8/9).