Sulbenox → N-(7-Hydroxy-4,5,6,7-tetrahydro-1-benzothiophen-4-yl)urea

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Reaction Steps

In the same manner as described in reducing the (-)-4,5,6,7-tetrahydro-7-oxobenzo[b]thien-4-ylurea, (+)-4,5,6,7-tetrahydro-7-oxobenzo[b]thien-4-ylurea is reduced with NaBH4 to afford isomer B of the title compound, m.p. 216°-217° C. (dec.), [α]D25.5 =+18.51° (c, 2.11 in methanol). This isomer is 95% pure by high pressure liquid chromatography. Isomer A of the title compound is also purified by high pressure liquid chromatography as a 90-95% pure material, m.p. 160°-164° C. (dec.), [α]D24.5 =-91.03° (c, 2.2 in methanol). The cis and trans configurations for isomers A and B have not been determined unequivocally.

Provenance & Evidence