@article{oai:soar-ir.repo.nii.ac.jp:00012510,
 author = {Abe,  Takashi and Okumura,  Yukihisa and Suga,  Hiroyuki and Kakehi,  Akikazu},
 issue = {1},
 journal = {HETEROCYCLES},
 month = {Jan},
 note = {3-[Bis(methylthio)methylene]-2(3H)-imidazo[1,2-a]pyridinones were prepared from the S-alkylation of pyridinium 1-[1-carbamoyl-1-[(methylthio) thiocarbonyl]]methylides with methyl iodide followed by the alkaline treatment of the resulting pyridinium salts. The reactions of these 3-methylene-2(3H)-imidazo[1,2-a]pyridinones with some ethyl cyano- or acyl-substituted acetates in the presence of a base did not afford the initially expected 2H-pyrano[2',3':4,5]imidazo[1,2-a]pyridine-2-one derivatives, but, instead of them, provided ethyl 3[2-hydroxyimidazo[1,2-a]pyridin-3-yl]acrylates. The thermolyses of these acrylates without any solvent under reduced pressure gave the corresponding 2H-pyrano[2',3':4,5]imidazo[1,2-a]pyridine-2-one derivatives., Article, HETEROCYCLES. 80(1):439-454 (2010)},
 pages = {439--454},
 title = {A New Approach to Imidazo[1,2-a]pyridine Derivatives and Their Application to the Syntheses of Novel 2H-Pyrano[2’,3’:4,5]imidazo[1,2-a]pyridin-2-one Derivatives},
 volume = {80},
 year = {2010}
}