Reductive cyclization of derivatives of 7-methyl-2-(2′- nitrophenyl)imidazo[1,2-a]pyridine (5) with hot triethyl phosphite has been investigated and the following transformations were achieved: (5)→(15), (6)→(16), and (7)→(11). Compound (11) afforded a 2 : 1 adduct (18) when treated with dimethyl acetylenedicarboxylate.
W. D. Ollis, S. P. Stanforth and C. A. Ramsden, J. Chem. Soc., Perkin Trans. 1, 1989, 961 DOI: 10.1039/P19890000961
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