2-Methylthieno-, thionaphtheno-, and thienothienopyridines
A general method for preparing 2-methylthieno-, thionaphtheno-, and thienothienopyridines has been developed. 2-Methylthieno [2, 3-b]-, -[3, 2-b] pyridines and 2-methylthionaphtheno [2, 3-b]-, -[3, 2-b] pyridines, which are new heterocyclic bases with a condensed thiophene ring, have been synthesized. Certain constants of these heterocyclic bases are quite close to those of the quinaldine and 2-methylnaphthoquinolines which are isosteric with them.