C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.N(C(OCC)=O)=NC(OCC)=O.O[CH2:33][C:34]1[CH:39]=[C:38]([CH2:40][OH:41])[CH:37]=[C:36]([CH2:42][OH:43])[CH:35]=1.[C:44]([OH:47])(=[S:46])[CH3:45]>C1COCC1>[C:44]([S:46][CH2:33][C:34]1[CH:39]=[C:38]([CH2:40][OH:41])[CH:37]=[C:36]([CH2:42][OH:43])[CH:35]=1)(=[O:47])[CH3:45]To a solution of triphenylphosphine (577 mg, 2.2 mmol) in anhydrous THF (5 mL) was added diethyl azodicarboxylate (2.2 M in toluene, 791 μL, 1.7 mmol) dropwise at 0° C. After stirred at 0° C. for 50 minutes, a solution of 1,3,5-tri(hydroxymethyl)benzene (269 mg, 1.6 mmol, prepared by reduction of trimethyl 1,3,5-benzenetricarboxylate with lithium aluminum hydride in THF, co-evaporated with dry benzene and dried on high vacuum for couple hours before use) and thioacetic acid (108 μL, 1.45 mmol) in dry THF (4 mL) was added dropwise. After 1 hour, the ice/water bath was removed and the reaction was stirred at room temperature for 15 hours. The solvents were removed by rotary evaporation in vacuo. The residue was purified by flash chromatography to give 5-acetylthiomethyl-1,3-bis(hydroxymethyl)-benzene as colorless solid (110 mg). 1H NMR (400 Hz, CDCl3): δ 7.13-6.99 (m, 3H), 4.45 (apt, J=20.4 Hz, 4H), 3.98 (apt, J=20.4 Hz, 4H), 3.73 (bs, 2H), 2.24 (apt, J=20.4 Hz, 3H); MS (ESI): m/z 249.0 (M+Na)+.
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