O,O-Diethyl dithiophosphate → 3-Hydroxybenzene-1-carbothioamide

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The procedure used for the preparation of 3a was repeated with 3-hydroxybenzonitrile (5.48 g, 46.1 mmol), (EtO)2P(S)SH (7.72 mL, 46.1 mmol) and water (9.2 mL) at 80° C. for 36 hr to give 3d (4.04 g, 57%) as a yellow solid after chromatographic purification on silica gel (gradient EtOAc/CH2Cl2 :6-12%) and crystallization from EtOAc/hexane. mp 139.0°-140.0° C.; IR (KBr) 3340, 3280, 3165, 1629, 1590, 1462 cm-1 ; 1H NMR (DMSO-d6) δ86.83 (1H, br d, J=7.0 Hz, Ar), 7.10-7.25 (2H, m, Ar), 7.27 (1H, s, Ar), 9.33 (1H, br s, NH), 9.58 (1H, s, OH), 9.72 (1H, br s, NH); FDMS m/z 153 (M+); Anal. Calcd for C7H7NOS: C, 54.88; H, 4.60; N, 9.14. Found: C, 55.01; H, 4.53; N, 9.02.

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