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. ... 4-Acylindoles are readily obtained by the [4π + 2π] cycloaddition of 1-triisopropylsilyl-trans-2- (2-phenylsulfinylvinyl)-pyrrole with electron deficient acetylenes followed by N-desilylation of the cycloadducts with fluoride ion. ... 4-Acylindoles are readily obtained by the [4 + 2] ...