Diisopropylamine → HCID 22145873, compound

Participants

Reaction Steps

n-Butyllithium (3.21 mL of 2.5 M solution) is added to a solution of diisopropylamine (1.15 mL) in dry tetrahydrofuran (25 mL) with the temperature being maintained below −60° C. After 30 min a solution of 3,5-dichloro-4-methylpyridine (1.21 g) in tetrahydrofuran (7 mL) is added dropwise and the mixture stirred for a further 30 min. A solution of 4-cyclopentyloxy-5-methoxypyridine-2-carboxaldehyde (1.65 g) in tetrahydrofuran (7 mL) is added and the mixture stirred for 4 hours whilst being allowed to warm to room temperature. After a further 18 hours at room temperature the mixture is diluted with saturated aqueous ammonium chloride (50 mL) and extracted with ethyl acetate. The extracts are washed with water, dried (MgSO4) and evaporated to give a yellow oil. The oil is triturated with n-pentane to give (±)-1-(4-cyclopentyloxy-5-methoxypyridin-2-yl)-2-(3,5-dichloropyridin-4-yl)ethanol (1.4 g) as an off-white solid, m.p. 110-112° C. [1Hnmr in D6-DMSO shifts relative to Me4Si:— 1.55-1.78, 6H, m; 1.95, 2H, m; 3.27, 2H, m; 3.79, 3H, s; 4.89, 2H, m; 5.64, 1H, d; 7.07, 1H, s; 7.98, 1H s; 8.54, 2H, s.].

Provenance & Evidence