Ethanol → (4-Chloro-2-pyridin-3-yl-thiazol-5-yl)-ethyl-carbamic acid tert-butyl ester

Participants

Reaction Conditions

Reaction Steps

To a suspension of 3-pyridine boronic acid (1.5 g, 12.2 mmol) in toluene (50 mL) was added absolute ethanol (25 mL) followed by a 2.0 M solution of K2CO3 (12.5 mL). To this mixture was added (2-bromo-4-chloro-thiazol-5-yl)-ethyl-carbamic acid tert-butyl ester (4.2 g, 12.2 mmol) followed by tetrakis(triphenylphosphine)palladium(0) (708 mg, 0.61 mmol). The reaction mixture was heated to 100° C. for 16 h. The mixture was cooled and diluted with ethyl acetate. The organic layer was washed with saturated aqueous NaHCO3, dried over Na2SO4, filtered and concentrated. The organic layer was purified by silica gel chromatography (0 to 100% ethyl acetate/hexanes) to afford a red oil (3.3 g, 79%): 1H NMR (300 MHz, CDCl3) δ 9.09 (d, J=1.9 Hz, 1H), 8.68 (dd, J=4.8, 1.6 Hz, 1H), 8.19 (dd, J=5.9, 4.2 Hz, 1H), 7.39 (dd, J=7.6, 5.2 Hz, 1H), 3.68 (q, J=7.2 Hz, 2H), 1.45 (s, 9H), 1.22 (t, J=7.0 Hz, 3H); ESIMS m/z 340 (M+1).

Provenance & Evidence