1,8-Diazabicyclo(5.4.0)undec-7-ene → 4-cyclopropyl-3-ethoxy-N-[(2-iodo-6-methoxyphenyl)sulfonyl]-5-oxo-4,5-dihydro-1H-1,2,4-triazole-1-carboxamide

Participants

Reaction Steps

A solution of 250 mg (0.80 mmol) of 2-iodo-6-methoxybenzenesulfonamide in 3 ml of acetonitrile is admixed at room temperature first with 254.08 mg (0.88 mmol) of 4-cyclopropyl-3-ethoxy-5-oxo-1-phenyloxycarbonyl-4,5-dihydro-1H-1,2,4-triazole and then slowly with 0.24 ml (1.60 mmol) of 1,8-diazabicyclo[5.4.0]undec-7-ene. After 60 min of stirring at room temperature the solution is adjusted slowly to a pH of 1 using 2 N salt solution. The precipitated solid is filtered off with suction, washed with diisopropyl ether and acetonitrile, and dried. This gives 267 mg (62% of theory) of 4-cyclopropyl-3-ethoxy-N-[(2-iodo-6-methoxyphenyl)sulfonyl]-5-oxo-4,5-dihydro-1H-1,2,4-triazole-1-carboxamide.

Provenance & Evidence