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. ... 3-Substituted N-(N′N′-diethylcarbamyl)indoles are prepared from indole-3-carboxaldehyde in good overall yield via N-acylindolium ion intermediates. ... A synthesis of 3-substituted indoles from indole-3-carboxaldehyde via N-acylindolium ions ( ). ... Cookies are used by this ...