Ethylmorpholine → N-[[6-methoxy-5-(pentafluoroethyl)-1-naphthalenyl]carbonyl]-N-methylglycine, methyl ester

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The crude 6-methoxy-5-(pentafluoroethyl)-1-naphthalene carboxylic acid (3.65 g, 11.4 mmol), 1-hydroxybenzotriazole (2.31 g, 17.1 mmol), dry distilled dimethylformamide (35 ml) and dicyclohexylcarbodiimide (2.82 g, 13.7 mmol) were stirred at room temperature for 1 hour. The mixture was cooled to 0° C., a solution of sarcosine methyl ester hydrochloride (3.18 g, 22.8 mmol) in dimethylformamide (30 ml) and N-ethyl morpholine (2.92 ml, 22.8 mmol) was added and stirring continued for 2 hours at room temperature. After cooling to 0° C., the precipitate (dicyclohexyl urea) was removed by filtration, the filtrate evaporated and the residue purified by HPLC (ethyl acetate/hexane 1:1, Waters Prep LC 500A). 1.5 g of pure, and 2.5 g of less pure N-[[6-methoxy-5-(pentafluoroethyl)-1-naphthalenyl]carbonyl]-N-methylglycine, methyl ester were obtained. nmr (DMSO): δ2.75 & 3.25 (2s, 3H, N--CH3, rotamers); δ3.75 (s, 3H, OCH3); δ3.97 (s, 3H, OCH3); δ4.35 (broad, 2H, N--CH2 --CO); δ7.7 (m, 5H, Har). ms: m/e 405 (M+), 303, 195, 102.

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