Compound of the formula
wherein R, and R2 are each independently -H or lower alkoxy; R3 and R4 are each independently lower alkyl; and Rs and R6 are each -OCH3 or together form -OCH2O-or -OCH2CH2O-, and pharmaceutically acceptable acid addition salts thereof are disclosed as calcium channel blockers useful for treating cardiovascular disorders, including angina, hypertension and congestive heart failure.
Compounds of the formula ##STR1## wherein R.sub.1 and R.sub.2 and each independently --H or lower alkoxy; R.sub.3 and R.sub.4 are each independently lower alkyl; and R.sub.5 and R.sub.6 are each --OCH.sub.3, or together form --OCH.sub.2 O-- or --OCH.sub.2 CH.sub.2 O--, and pharmaceutically acceptable acid addition salts thereof are prepared by cyclizing, deoxygenating, coupling, or hydrogenating the intermediates disclosed herein.