O,O-Diethyl dithiophosphate → 2,6-Dihydroxybenzenecarbothioamide

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The procedure used for the preparation of 3a was repeated with 2,6-dihydroxybenzonitrile (8.75 g, 64.8 mmol), (EtO)2P(S)SH (32.6 mL, 194 mmol) and water (26 mL) at 60° C. for 36 hr to give 3b (4.76 g, 43%) as a light yellow solid after chromatographic purification on silica gel (gradient EtOAc/CH2Cl2 :0-5%) and crystallization from EtOAc/hexane. mp 180° C. (dec); IR (KBr) 3411, 3295, 3177, 2380, 1612, 1577, 1464, 1267, 1010 cm-1 ; 1H NMR (DMSO-d6) δ6.31 (2H, d, J=8.1 Hz, Ar), 7.00 (1H, t, J=8.1Hz, Ar), 9.60 (1H, br s, NH), 9.96 (1H, br s, NH), 10.93 (2H, s, OH); FABMS m/z 169 (M+), 170 (M+ +1); Anal. Calcd for C7H7NO2S: C, 49.69; H, 4,17; N, 8.28. Found: C, 49.89; H, 4.23; N, 8.36.

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