Benzodioxole compounds of the formula: vasodilator ##STR1## WHEREIN R.sub.1 is hydrogen, lower alkyl, aryl, haloaryl, lower-alkylaryl, lower-alkoxyaryl, methylenedioxyaryl, ethylenedioxyaryl, trifluoromethylaryl, nitroaryl or aminoaryl,R.sub.2 is lower-alkyl, aryl, haloaryl, lower-alkylaryl, lower-alkoxyaryl, methylenedioxyaryl, ethylenedioxyaryl, trifluoromethylaryl, nitroaryl or aminoaryl, orR.sub.1 + r.sub.2 are --(CH.sub.2).sub.4 --, --(CH.sub.2).sub.5 -- or --(CH.sub.2).sub.6 -- andHet is pyridyl, pyrimidinyl, pyridazinyl, pyrazinyl, quinazolinyl, 1,3,5 triazinyl or 1,3-thiazolyl, each being optionally substituted by lower-alkyl, lower-alkoxy, hydroxyl or phenyl.These compounds are used as medicines especially as peripheral vasocilator agent and central nervous system stimulant.