[O:1]1[C:5]2[CH:6]=[CH:7][C:8]([CH2:10][CH2:11][SH:12])=[CH:9][C:4]=2[O:3][CH2:2]1.[SH:13][CH2:14][CH2:15][OH:16].II.C(OCC)(=O)C>C(O)C.O>[O:1]1[C:5]2[CH:6]=[CH:7][C:8]([CH2:10][CH2:11][S:12][S:13][CH2:14][CH2:15][OH:16])=[CH:9][C:4]=2[O:3][CH2:2]135 g of 2-(1,3-benzodioxol-5-yl)ethanethiol and 75 g of 2-mercaptoethanol were dissolved in 150 ml of ethanol, followed by the additional of 43 g of iodine. The obtained mixture was stirred at a room temperature for 30 minutes, followed by the addition of 2 l of ethyl acetate and 2 l of water. The mixture was separated into two phases. The ethyl acetate layer was washed with water twice, then with 1 l of a 1% aqueous solution of sodium hydrogensulfite twice and finally with water thrice, dried over anhydrous sodium sulfate and filtered. The filtrate was distilled to remove the solvent. The residue was purified by silica gel column chromatography (benzen/ethyl acetate=10:1) to obtain 11.5 g of the title compound as a colorless oil.
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