Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... Catalytic hydrogenation (Pd·C) of 2-(2-benzylaminoethyl)-3-cyanomethyl indoles gave hexahydroazepino[4,5-b]indoles in good yields. 2-(2-Benzylaminoethyl)-3 cyanoethyl indoles were cyclized to hexahydroazocino[4,5-b]indoles under identical conditions.