Sodium Carbonate → 1-[5-(3-Amino-5-nitrophenyl)-1,3-thiazol-2-yl]cyclobutanol

Participants

Reaction Conditions

Reaction Steps

To a solution of commercially available (3-amino-5-nitrophenyl)boronic acid (18 g, 99 mmol) and Intermediate 1 (25.5 g, 109 mmol) in DME (360 mL) were added tetrakis(triphenyl-phosphine)palladium(0) (5.72 g, 4.95 mmol) and 2M Na2CO3(aq) (148 mL, 297 mmol), and the mixture was degassed and then heated to 85° C. for 5 hours. After cooling to room temperature, the mixture was diluted with ethyl acetate (500 mL) and filtered through Celite (ethyl acetate rinse). The filtrate was washed with brine (300 mL), dried (Na2SO4) and concentrated in vacuo. The impure material was split into two batches, and each purified by Chromatography on silica gel (70:30 to 0:100 hexanes:ethyl acetate) then the product fractions from the two purifications were combined and concentrated in vacuo to provide 26.53 g (91 mmol, 92%) of 1-[5-(3-amino-5-nitrophenyl)-1,3-thiazol-2-yl]cyclobutanol as a green solid. MS ESI: [M+H]+ m/z 292.0. 1H NMR (DMSO-d6): δ 8.15 (1H, s), 7.54 (1H, s), 7.33 (1H, s), 7.14 (1H, s), 6.58 (1H, s), 6.00 (2H, s), 2.56-2.47 (2H, m), 2.39-2.29 (2H, m), 1.95-1.83 (2H, m).

Provenance & Evidence