Cyclization of 2,4‐dinitronaphth‐1‐yl amino acids and their analogues to naphthimindazol‐N‐oxides: Kinetics and mechanism

A variety of novel naphthimindazol‐N‐oxides and naphththiazol‐N‐oxide have been prepared in a simple two‐step process. The first step involves the reaction of 1‐chloro‐2,4‐dinitronaphthalene with glycine, alanine, glycolic acid, thioglycolic acid, and their methyl esters affording substitution produ...

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Bibliographic Details
Published in:Journal of physical organic chemistry 2024-01, Vol.37 (1), p.n/a
Main Authors: Omar, Alaa Z., Khattab, Sherine N., Ibrahim, Mahmoud F., El‐Sadany, Samir K., Hamed, Ezzat A.
Format: Article
Language:English
Subjects:
Alanine
Amino acids
Esters
Glycine
Glycolic acid
imidazol‐N‐oxide
Kinetics
Meisenheimer
Nitrogen
Reaction mechanisms
second order
Substitution reactions
UV spectra
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Summary:A variety of novel naphthimindazol‐N‐oxides and naphththiazol‐N‐oxide have been prepared in a simple two‐step process. The first step involves the reaction of 1‐chloro‐2,4‐dinitronaphthalene with glycine, alanine, glycolic acid, thioglycolic acid, and their methyl esters affording substitution products, the subsequent treatment of which with base furnishes naphthimindazol‐N‐oxide and naphththiazol‐N‐oxide derivatives. Stepwise reaction mechanisms via carbanions, nitrogen anions, and spiro Meisenheimer intermediates are proposed. The action of 10% NaOH in dioxane on the substitution products was measured spectrophotochemically, and the kinetic studies suggested that the N‐naphthyl glycine and N‐naphthyl alanine follow a second‐order rate law while S‐naphthyl thioglycolic acid is accurately first‐order kinetics. Reaction of 1‐chloro‐2,4‐dinitronaphthalene with amino acids and their methyl esters.
ISSN:0894-3230
1099-1395
DOI:10.1002/poc.4568