NOVEL THIAZOLE DERIVATIVES AND THEIR PREPARATION

摘要

1-(4-Bromomethyl-2-thiazolyl)guanidine, and its acid addition salts, especially 1-(4-bromomethyl-2-thiazolyl)guanidine hydrobromide are novel compounds useful as starting materials for the synthesis of famotidine. These compounds can be produced without need for prolonged reaction periods at extremely low temperatures by mixing 1,3-dibromoacetone and 2-imino-4-thiobiuret in a suitable reaction medium. Moreover, the novel compounds can be selectively synthesized in good yield and purity from a raw material containing a combination of structurally similar analogs of 1,3-dibromoacetone.