A series of 1-cyano and 2-cyanohexahydroindolizino [8, 7-b] indole derivatives was prepared by 1, 3-dipolar cycloaddition of acrylonitrile with ylides derived from 3, 4-dihydro-β- carboline and its 6-methoxy, 6-benzyloxy, 9-methyl and 9-benzyl analogues. The products, together with their reduced 1-or 2-aminomethyl derivatives, were evaluated for cytotoxic activity in L1210 cancer cells. Compounds derived from 6-benzyloxy or 9-benzyl-3, 4- ...