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A new synthetic approach for the synthesis of novel 5H-dibenz[b,f]The key step of this methodology is based on Friedel-Crafts ring closure of nitrogen containing carboxylic acids and alkanols in the presence of AlCl 3 , P 2 O 5 or PPA catalysts in overall high yields.The starting carboxylic acids were prepared via an unequivocal synthetic pathway by the basic hydrolysis of trimethyloxindole followed by N-arylation reactions.
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El‐Aal et al. (2013) studied this question.
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