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. ... The addition of different amines to indole-4,7-quinone is studied. The application of this reaction with indolyl-2-oxoethylamine lead to the preparation of an analogue of wakayin 2. ... The addition of different amines to the N-sulfonyl-indole-4,7-quinone is described. This reaction is ...