Pyrido-1,2,4-thiadiazine and pyrido-1,4-thiazine derivatives, their preparation and use

摘要

Pyrido-1,2,4-thiadiazine and pyrido-1,4-thiazine derivatives represented by the formula <IMAGE> wherein A, B, D, R1, R2, R3 and R4 are defined in the description, compositions thereof and methods for preparing the compounds are described. The compounds are useful in the treatment of diseases of the central nervous system, the cardiovascular system, pulmonary system, the gastrointestinal system and the endocrinologic system.