Chemistry of Heterocyclic Compounds p. 903 - 907 (1991)
Update date:2022-08-17
Topics:
Ukrainets, I. V.
Bezuglyi, P. A.
Treskach, V. I.
Slobodzyan, S. V.
The possibility was examined of using various condensing agents in the intramolecular cyclization reaction of ethyl ester of 2-carbomalonanilic acid into 2-carboethoxymethyl-4H-3,1-benzoxazin-4-one.It was found that the optimal reagent is dicyclohexylcarbodiimide.By using NMR spectroscopy and deutero-exchange it was shown that the cyclization proceeds with the participation of the hydroxyl group of the carboxyl and a proton of the amide function.
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Doi:10.1021/jacs.0c06305
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