Modern Friedel-Crafts chemistry: Part 36. Facile synthesis of some new pyrido[3,2,1-jk]carbazoles via Friedel-Crafts cyclialkylations

An efficient methodology for the synthesis of novel substituted pyrido[3,2,1-jk]carbazole via Friedel-Crafts cyclialkylations is reported. The methodology was realized by three-step protocol involved the addition of carbazole to 3-methylcrotononitrile. The resulted nitrile was hydrolyzed to desired ester, followed by addition of Grignard reagents to afford tertiary alcohols and/or reacted directly with different Grignard reagent to form the desired ketones. The later ketones were converted to both secondary and tertiary alcohols by reduction with LAH and addition of Grignard reagents respectively. These carbinols were cyclialkylated under Friedel-Crafts conditions catalyzed by AlCl3/CH3NO2, PTSA and PPA to give tri-and tetrasubstituted pyrido[3,2,1-jk]carbazole.

Abstract licence: CC BY

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