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10.40 g (0.04 mol) of methyl 5,8-dimethyl-4-oxo-6-thiochromanecarboxylate were dissolved in 200 ml of ethanol and, a little at a time, admixed with 0.89 g (0.023 mol) of sodium borohydride. The mixture was subsequently stirred at room temperature for another 1 h and then concentrated using a rotary evaporator. The residue was taken up in 200 ml of ethyl acetate, washed with sat. NaCl solution (2×100 ml), dried over MgSO4 and concentrated using a rotary evaporator.

1. concentrationconcentrated
2. customa rotary evaporator
3. washwashed with sat. NaCl solution (2×100 ml)
4. dry with materialdried over MgSO4
5. concentrationconcentrated
6. customa rotary evaporator