Sodium borohydride → 4-(6-Chloro-benzo[b]thiophene-2-sulfonyl)-1-(4-hydroxy-4,5,6,7-tetrahydro-benzothiazol-2-ylmethyl)-piperazin-2-one

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Reaction Steps

To the suspension of 2-[4-(6-chloro-benzo[b]thiophene-2-sulfonyl)-2-oxo-piperazin-1-ylmethyl]-6,7-dihydro-5H-benzothiazol-4-one (7 mg, 0.01 mmol) in EtOH (1 mL) is added sodium borohydride (3 mg, 0.08 mmol). After 15 min the reaction is diluted with EtOAc and washed with 1N HCl, NaHCO3 and brine. The solution is dried (MgSO4) and concentrated to provide 4-(6-chloro-benzo[b]thiophene-2-sulfonyl)-1-(4-hydroxy-4,5,6,7-tetrahydro-benzothiazol-2-ylmethyl)-piperazin-2-one. 1H NMR (300 MHz, CDCl3) δ 7.88-7.82 (m, 3H), 7.46 (dd, 1H), 4.83-4.81 (m, 1H), 4.76 (s, 1H), 4.75 (s, 1H), 3.92 (s, 1H), 3.91 (s, 1H), 3.62-3.55 (m, 2H), 3.47-3.41 (m, 2H), 2.76-2.62 (m, 2H), 2.05-1.78 (m, 4H); MS (Ion Spray) 498 (M+H)+.

Provenance & Evidence