Benzoic acid, 2-(isocyanatosulfonyl)-, methyl ester → HCID 19048089, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 1.31 g (10 mmol) of 4-hydroxy-5-methoxy-2,4-dihydro-3H-1,2,4-triazol-3-one, 2.89 g (12 mmol) of 2-methoxycarbonyl-phenylsulphonyl isocyanate and 40 ml of acetonitrile is stirred for 5 hours at 20° C. and subsequently concentrated under a water pump vacuum. The residue is stirred with diethyl ether, and the product which has been obtained in crystalline form is isolated by filtration with suction and recrystallised from isopropanol. 1.22 g (33% of theory) of 4-hydroxy-5-methoxy-1-(2-methoxycarbonyl-phenylsulphonylaminocarbonyl)-2,4-dihydro-3H-1,2,4-triazol-3-one of melting point 180° C. are obtained.

Provenance & Evidence