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2,4-dioxo-2,4-dihydro-1H-benzo[d][1,3]oxazine-8-carboxylic acid synthesis

2synthesis methods
-

Yield:-

Steps:

Multi-step reaction with 2 steps
1: sulfuric acid; Caswell No. 744A; lithium hydroxide monohydrate / 2 h / 27 °C
2: sulfuric acid; NaNO2 / 3 h / 27 °C

References:

Gondi, Sudershan R.;Shaik, Althaf;Westover, Kenneth D. [Journal of Organic Chemistry,2022,vol. 87,# 1,p. 125 - 136]