Dimethylformamide → 2-Fluoro-4-{5-[2-(methoxymethyl)-2'-methylbiphenyl-4-yl]-1,2,4-oxadiazol-3-yl}benzoyl chloride

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Reaction Steps

To a solution of example 35 (2 170 mg; 5.2 mmol) in dry DCM (40 mL), oxalyl chloride (1 316 μl; 15.6 mmol) was added followed by dry DMF (40 μl). The reaction mixture was stirred at RT for 2 h and concentrated to afford 2-fluoro-4-{5-[2-(methoxymethyl)-2′-methylbiphenyl-4-yl]-1,2,4-oxadiazol-3-yl}benzoyl chloride as a white powder (2300 mg, 100%). In dry THF (1 mL) with a catalytic amount of DMF was swelled morpholinomethyl polystyrene high loading resin (NovaBiochem; 35.77 mg; 0.14 mmol), 3.9 mmol/g). 2-Fluoro-4-{5-[2-(methoxymethyl)-2′-methylbiphenyl-4-yl]-1,2,4-oxadiazol-3-yl}benzoyl chloride (25 mg; 0.06 mmol) was added followed by sarcosine methyl ester hydrochloride (15.98 mg; 0.11 mmol). The mixture was stirred overnight at rt. Isocyanate resin Si—NCO (Argonaut, 97 mg; 1.5 eq; 1.7 mmol/g) was added and the mixture stirred for 2 h. It was filtered through a SAX column (2 g) to obtain the title compound as a colorless oil. LC/MS (Method B): 504.2 (M+H)+ HPLC (Method A) Rt: 5.39 min (purity: 97%).

Provenance & Evidence