Sodium borohydride → HCID 9818164, compound

Participants

Reaction Steps

A stirred solution of 3-(3-cyclopentyloxy-4-methoxyphenyl)-4,5-dihydrothiophene 1,1-dioxide (1.2 g; which is prepared as described in Example 13) in ethanol (50 mL) is treated with sodium borohydride (0.45 g) followed by cobalt dichloride hexahydrate (0.94 g), and the purple mixture is stirred at room temperature for 6 hours. It is then filtered through a pad of diatomaceous earth, and the pad is washed with dichloromethane (150 mL). The combined flitrate and washings are evaporated, and the resulting residue is subjected to flash chromatography on silica gel, using a mixture of ethyl acetate and toluene as eluent, to give an oil which slowly crystallizes. It is recrystallized from ethyl acetate at -40° C., to give 3-(3-cyclopentyloxy-4methoxyphenyl)tetrahydrothiophene 1,1-dioxide (0.74 g) in the form of a white solid, m.p. 89°-90° C. [Elemental analysis: C,61.8; H,7.10; S,10.4%; calculated: C,61.91; H,7.1; S,10.33%].

Provenance & Evidence