Water → HCID 10570152, compound

Participants

Reaction Steps

4-Toluenesulphonyl chloride (5.9 g) was added to a solution of (S)-7-chloro-1,4-benzodioxan-2-ylmethanol (6.0 g; prepared by the method described above) in pyridine (40 ml) and the mixture stirred for 4 hours. More 4-toluenesulphonyl chloride (250 mg) was added, stirring continued for 2 hours, then further 4-toluenesulphonyl chloride (250 mg) was added and stirring continued for 1 hour. The mixture was poured into water (200 ml) and extracted with ethyl acetate (2×200 ml). The combined extracts were washed with hydrochloric acid (2M; 2×200 ml), saturated aqueous sodium bicarbonate solution (2×200 ml) and brine (200 ml), then dried over magnesium sulphate. The solvent was removed in vacuo and the residue recrystallised from ether to give (R)-7-chloro-1,4-benzodioxan-2-ylmethyl 4-toluenesulphonate (7.00 g) m.p. 90-91° C.

Provenance & Evidence