Potassium Carbonate → HCID 86679888, compound

Participants

Reaction Conditions

Reaction Steps

Methyl 2-bromo-5-(4-(3,4-dichlorophenyl)thiazol-2-yl)benzoate (177 mg, 0.4 mmol) was taken up in CH2Cl2 and washed with aqueous Na2CO3. The organic layer was dried (MgSO4), filtered, and evaporated. Dioxane (2 mL) was added, along with tetrakis(triphenylphosphine)palladium(0) (37 mg, 0.032 mmol), 3 M aqueous K2CO3 (267 μL, 0.8 mmol) and phenylboronic acid (available from ASDI Incorporated; 97.5 mg, 0.8 mmol). The vial was evacuated and filled with nitrogen, and then the mixture was heated at 100° C. for 20 h. The mixture was purified on an ISCO Combiflash system, using 0-15% ethyl acetate/hexanes as eluent. Fractions homogeneous for the product were evaporated, and the resulting material was dissolved in THF (2 mL). 1 M aqueous NaOH (2 mL) was added and the mixture was heated at 60° C. overnight. 1 M aqueous HCl was added to bring the pH to approximately 2, and the mixture was extracted 4 times with EtOAc. The combined organic layers were washed with brine, dried (Na2SO4), filtered, evaporated, and purified by preparative HPLC, using the conditions outlined in General Procedure A for Suzuki Coupling and Hydrolysis in Parallel Mode, to give 4-[4-(3,4-dichloro-phenyl)-thiazol-2-yl]-biphenyl-2-carboxylic acid (33 mg, 20%) as a yellow solid. 1H NMR (400 MHz, DMSO-d6) δ ppm 8.45 (s, 1H), 8.32 (d, J=1.6 Hz, 2H), 8.20 (dd, J=8.2, 2.0 Hz, 1H), 8.07 (dd, J=8.2, 2.0 Hz, 1H), 7.74 (d, J=8.6 Hz, 1H), 7.55 (d, J=8.2 Hz, 1H), 7.35-7.48 (m, 5H).

Provenance & Evidence