Triethylamine → N-Methoxy-N'-(7-oxo-4,5,6,7-tetrahydro-1-benzothiophen-4-yl)urea

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Reaction Steps

The crude ether solution of 4,5,6,7-tetrahydro-7-oxobenzo[b]thien-4-yl isocyanate prepared in Example 4 is added dropwise to a mixture of methoxyamine hydrochloride (9.02 g), triethylamine (13.67 g) and ether (50 ml) under a nitrogen atmosphere. After stirring for 36 hours at room temperature, the solid in the reaction mixture is collected and washed with water. The water-insoluble solid is recrystallized twice from acetone-hexane to afford the title urea, m.p. 185° to 188.5° C.

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