反应详情

(viv) 5-(4-Methyl-4-nitropentylidene)hydantoin is reduced with a transition metal catalyst (such as palladium) and the like to give 5-(4-methyl-4-nitropentyl)hydantoin. For example, 5-(4-methyl-4-nitropentylidene)hydantoin is reacted with hydrogen gas upon addition of palladium-carbon (generally 0.1–5 mol %, preferably 0.5–2 mol %) in a mixed solvent of a water soluble solvent, such as methanol, ethanol and the like, and water for 1–12 h, preferably 2–5 h. The reaction solvent is concentrated to dryness to give 5-(4-methyl-4-nitropentyl)hydantoin. The obtained 5-(4-methyl-4-nitropentyl)hydantoin can be isolated and/or purified by a conventional method, such as chromatography and the like, but generally, can be used in the next step without isolation and/or purification.

1. custompreferably 2–5 h
2. concentrationThe reaction solvent is concentrated to dryness