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Modern Friedel-Crafts chemistry. Part 32.†
Facile synthesis of some new fused heteropolycycles via direct intramolecular Friedel-Crafts cyclialkylations of suitable heteroarylalkanols

Research Authors
Ali A. Khalaf,* Ahmed M. El-Khawaga, Ibrahim M. Awad, and
Hassan A. K. Abd El-Aal
Research Abstract

This study provides expedient methods for the synthesis of some novel fused heteropolycycles. Thus, a variety of fused di-, tri- and tetracyclic nitrogen and nitrogen-sulfur heteropolycycles 8, 9, 11-15 were smoothly synthesized by Friedel-Crafts intramolecular alkylations of heteroarylalkanols 1-7 in the presence of both Brönsted (PPA and PTSA) and Lewis (AlCl3/CH3NO2) acid catalysts. The precursor alkanols were readily prepared by reaction of the corresponding carboxylic acid esters with methylmagnesium iodide. The structures of the compounds are established using both spectral and analytical data. A plausible carbocation mechanism is proposed to account for the results.

Research Department
Research Journal

ARIVOK
Research Member
Research Rank
1
Research Vol
x
Research Year
2010
Research Pages
338-349