alkylation of the ortho-alkyl group in the N-arylamino moiety of various N-(1-allylcycloalkyl)-N-arylamines resulting in alkyl-substituted 3′,4′-dihydro-1′H-spiro[cycloalkane-1,2′-quinolines] is described. The mechanistic details of this intramolecular Friedel−Crafts alkylation by an alkene moiety can be explained by an intramolecular alkylation with ipso substitution of alkylgroups and their 1,2-rearrangement
4-Methyl-3,4-dihydrospiro[cycloheptane-1′,2(1<i>H</i>)-quinoline] and 4-methyl-3,4-dihydrospiro[cyclooctane-1′,2(1<i>H</i>)-quinoline]. synthesis of derivatives and chemical transformations
New derivatives of 3,4-dihydrospiro[cycloalkane-1′,2(1H)-quinolines] were obtained from cycloheptanone and cyclooctanone via facile three steps hetero spiro annulation process. Their nitro derivatives were prepared through electrophilic substitution reactions.
A series of new spiro-C6-annulated hydrogenated cyclopenta[g]indoles (5) was prepared by applying Madelung method to the appropriate 4-(N-acetylamino)-1-spiroindanes (9), synthesised via acid-catalysed intramolecular rearrangement of 1-acetyl-3,4-dihydrospiro[quinoline-2,1′-cycloalkanes] (8).