[CH3:1][O:2][C:3]([C:5]1[CH:6]=[CH:7][CH:8]=[C:9]2[C:14]=1[S:13][CH2:12][CH:11]=[CH:10]2)=[O:4]>C(O)C>[CH3:1][O:2][C:3]([C:5]1[CH:6]=[CH:7][CH:8]=[C:9]2[C:14]=1[S:13][CH2:12][CH2:11][CH2:10]2)=[O:4]Methyl-2H-thiochromene-8-carboxylate (1.83 g, 8.88 mmol) was dissolved in ethanol (100 ml) and treated with 10% PdC (1.5 g). The mixture was then hydrogenated at atmospheric pressure at room temperature. After 19 h the reaction mixture was filtered through celite and evaporated under reduced pressure to give a colourless oil which was dried in vacuo to give the title compound (1.25 g, 68%)
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