Toluene → 4-[4-(tert-Butoxycarbonyl)piperazin-1-yl]benzyl alcohol

Participants

Reaction Conditions

Reaction Steps

Diisobutylaluminium hydride in toluene (1.5M, 15 ml, 22.5 mmol) was added dropwise to a solution of 1-(tert-butoxycarbonyl)-4-(4-methoxycarbonylphenyl)piperazine (2.90 g, 9.05 mmol) in THF (116 ml) at 0° C. The mixture was stirred at 0° C. for 2 hours then allowed to warm to room temperature. The solution was recooled to -4° C. and the reaction quenched by the addition of methanol (6 ml), water 3 ml) and finally 2M sodium hydroxide (3 ml). The mixture was allowed to warm to room temperature, the precipitated aluminium salts collected under suction and washed with dichloromethane. The filtrate was concentrated in vacuo and the residue purified by flash chromatography, eluting with dichloromethane/ethyl acetate, to give the title compound (2.30 g, 74%); δH (CDCl3) 1.48 (9H, s, C(CH3)3), 1.60 (1H, v br, CH2OH), 3.13 (4H, m, 2×piperazinyl CH3), 3.58 (4H, m, 2×piperazinyl CH2), 4.61 (2H, s, CH2OH), 6.92 (2H, m, ArH), and 7.29 (2H, m, ArH).

Provenance & Evidence