Sodium borohydride → HCID 21960097, compound

Participants

Reaction Steps

To a starred solution of 1-[4-[3-[4-(6-fluoro-1,2-benzisothiazol-3-yl)-1-piperidinyl]propoxy]3-methoxyphenyl]ethanone (4.1g, 9.3 mmol) in 60 mi MeOH--THF (1:1) under N2 at ambient temperature, NaBH4 (0,386g, 10.2 mmol) was added portionwise. After complete addition, the reaction was stirred for 3.5 hours and was concentrated to yield a white gum. This was triturated with H2O (2×) and the aqueous fraction was decanted away. Residual water was removed under high vacuum to afford 5.0 of a white powder. The compound was taken up in boiling toluene and the insolubles were filtered away. Concentration of the toluene filtrate afforded 3.8g of a beige solid. Purification via preparative HPLC (Water's Associates prep LC/System 500, using 2 silica gel columns and 2% Et2NH--EtoAc) provided 2.7 g of a light beige solid. The product was recrystallized from EtoAc to afford 1.7g (42%) of a pure white powder, m.p.=113°-115° C.

Provenance & Evidence