79834-09-6

Upstream product

• 7335-35-5 1-hydroxy-3-phenylurea 
• 624-48-6 dimethyl cis-but-2-ene-1,4-dioate 
• 152975-96-7 1,1,1-Triphenyl-3,4-bis(methoxycarbonyl)-2-aza-1λ⁵-phosphabuta-1,3-diene 
• 103-71-9 phenyl isocyanate 

Downstream Products

• 731-54-4 (Z)-ethyl 2-(2,5-dioxo-1-phenylimidazolidin-4-ylidene)acetate 

Relevant academic research and scientific papers

Synthesis of N-functionalized carbodiimides, hydantoins, 1,3-diazetidines, and imidazolidine derivatives from N-vinylic phosphazenes derived from β-amino acids

Synthesis of N-vinylic carbodiimides through Aza-Wittig reaction of N-vinylic phosphazenes with isocyanates is reported. These heterocumulenes are used for the preparation of unsymmetrical ureas and nitrogen heterocycles such as hydantoins, 1,3-diazetidines, imidazolidinones, and bis-imidazolidinone azines.

Action des hydroxyurees sur les maleate et fumarate de methyle. Obtention des carbomethoxy-5 oxa-6 dihydrouraciles; transposition en carbomethoxymethylene-5 hydantoines

We describe in this paper the Michael-type addition of hydroxyureas with methyl maleate and fumarate.The cyclization of the ureidoxyester intermediates obtained leads to the isolation of 5-carbomethoxy 6-oxadihydrouracils; their structure is proved by X-ray analysis.These relatively unstable compounds undergo transposition under basic conditions and give 5-carbomethoxyhydantoins.