Isopropylamine → 2-[2-(3-Butyl-5-methyl-isoxazol-4-yl)-ethyl]-thiazole-5-carboxylic acid isopropylamide

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of isopropylamine (130 mg, 2.2 mmol) in dioxane (3 mL) under argon and at room temperature was added trimethylaluminium (0.65 mL of a 2M solution in toluene, 1.3 mmol). After 1 h, a solution of 2-[2-(3-butyl-5-methyl-isoxazol-4-yl)-ethyl]-thiazole-5-carboxylic acid methyl ester (170 mg, 0.55 mmol) in dioxane (3 mL) was added and the reaction mixture heated at 90° C. overnight. The reaction mixture was then cooled, quenched with ice water and extracted with dichloromethane. The combined extracts were washed with Seignette's salt solution then dried, filtered, and concentrated. Purification by chromatography (silica, 0 to 6% methanol in dichloromethane then heptane:ethyl acetate=100:0 to 1:4) gave the title compound (30 mg, 16%) as a white solid. MS: m/e=336.5 [M+H]+.

Provenance & Evidence