(3-ARYL-PIPERAZIN-1-YL), (2-ARYL-MORPHOLIN-4-YL) AND (2-ARYL-THIOMORPHOLIN-4-YL) DERIVATIVES OF 6,7-DIALKOXY-QUINAZOLINE, 6,7-DIALKOXYPHTALAZINE AND 6,7-DIALKOXYISOQUINOLINE
(3-ARYL-PIPERAZIN-1-YL), (2-ARYL-MORPHOLIN-4-YL) AND (2-ARYL- THIOMORPHOLIN-4-YL) DERIVATIVES OF 6,7-DIALKOXYQUINAZOLINE, 6,7- DIALKOXYPHTALAZINE AND 6,7-DIALKOXYISOQUINOLINE