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Note | Regular issue | Vol 60, No. 6, 2003, pp.1419-1424
Published online, 28th April, 2003
DOI: 10.3987/COM-03-9752
Dependence of Ring Size on Conditions in Cyclization of 4-Methylaminobenzoic Acid by Dichlorotriphenylphosphorane

Isao Azumaya,* Takao Okamoto, Imabeppu Fumiaki and Hiroaki Takayanagi

*School of Pharmaceutical Sciences, Kitasato University, Shirokane, Minato-ku, Tokyo 108-8641, Japan


4-Aminobenzoic acid was effectively coupled by dichlorotriphenylphosphorane to give cyclized aromatic amides with various ring sizes. Major compounds were trimer and hexamer. The ratios and yields of the compounds obtained by the reaction depended on the reaction conditions.