LeRoy H. Klemm, Charles E. Klopfenstein, Reinhard Zell, David R. McCoy, R. A. Klemm
Chemistry of thienopyridines. III. Syntheses of the thieno[2,3-b]- and thieno[3,2-b]pyridine systems. Direct substitution into the former system
J. Org. Chem., 1969, 34 (2), pp 347–354
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http://dx.doi.org/10.1021/jo01254a020
