Acetonitrile → HCID 14628105, compound

Participants

Reaction Steps

A mixture of 2.0 g (12 mmol) of 3-bromo-4-methylpyridine, 2.5 mL of CH3CN, 3.2 mL (23 mmol) of Et3N, 5.8 g (58 mmol) of ethyl acrylate, and 0.095 g (0.12 mmol) of PdCl2(dppf).CH2Cl2 is stirred in an evacuated and sealed pressure tube at 125° C. for 1 h. The mixture is concentrated and purified by flash chromatography (5-60% EtOAc in hexanes) to provide 1.0 g (47%) of (E)-3-(4-methyl-pyridin-3-yl)-acrylic acid ethyl ester as a dark oil. This material is stirred in 2 mL of toluene with 0.70 mL (6.0 mmol) of benzyl bromide at 60° C. overnight. The resulting precipitate is filtered and washed with toluene to provide 1.4 g (4.0 mmol) of the benzyl pyridinium bromide as a white powder. To this material in 20 mL of EtOH at 0° C. is added 0.30 g (8.0 mmol) of NaBH4 in portions over 30 minutes. The mixture is stirred for 90 min, concentrated by half, dissolved in CH2Cl2, washed twice with water and once with brine, dried over Na2SO4, filtered, and concentrated. Flash chromatography (5-50% EtOAc in hexanes) provides 0.42 g (1.5 mmol) of (E)-3-(1-benzyl-4-methyl-1,2,5,6-tetrahydro-pyridin-3-yl)-acrylic acid ethyl ester as a yellow oil. This material is stirred in 3 mL of EtOH with 42 mg of Pd/C under an H2 atmosphere overnight. The vessel is evacuated with N2, filtered through diatomaceous earth, and concentrated to provide 208 mg of I-031 as a yellow oil.

Provenance & Evidence