82594-82-9

Upstream product

• 5392-82-5 2,5-dichlorophenylisocyanate 
• 82594-86-3 2-[3-(2,5-Dichloro-phenyl)-ureido]-benzoic acid methyl ester 
• 1566-75-2 2-[3-(2,5-Dichloro-phenyl)-ureido]-benzoic acid 
• 118-92-3 anthranilic acid 
• 134-20-3 2-carbomethoxyaniline 

Relevant academic research and scientific papers

Efficient synthesis of 4H-benzo[d][1,3]oxazin-4-ones from anthranilic acids and aryl isoselenocyanates

A synthesis in good to excellent yields of 23 4H-benzo[d][1,3]oxazin-4- ones, 18 of which are novel, from monosubstituted anthranilic acids and variously substituted phenyl isoselenocyanates without using any harsh reagents has been developed. The Se powder precipitated during the reaction could be efficiently recycled for the preparation of the aryl isoselenocyanates.

Convenient Preparation of N-substituted 2-Amino-4H-3,1-benzoxazin-4-ones and 3-Substituted 2,4(1H,3H)-Quinazolinediones

Room temperature of 2-(3-arylureido)benzoic acids (1) and methyl2-(3-alkyl-, or 3-arylureido)-benzoates (2) with concentrated sulfuric acid leads to N-substituted 2-amino-4H-3,1-benzoxazin-4-ones (3) in generally very good yields.The isomeric 3-substitute