Triethylamine → (2R,4R)-7-biphenyl-4-ylmethyl-2,4-dimethyl-6-oxo-nonanedioic acid 9-tert-butyl ester 1-ethyl ester

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Reaction Steps

To a stirred solution of 2-biphenyl-4-ylmethyl-succinic acid 4-tert-butyl ester (100 mg, 0.29 mmol) in DMF (10 mL) is added HOBt (45 mg, 0.29 mmol) and EDCl (56 mg, 0.29 mmol) and the mixture is stirred at room temperature for 10 minutes then (2R,4R)-4-amino-2-methyl-pentanoic acid ethyl ester trifluoroacetate (47 mg, 0.29 mmol) and triethylamine (89 mg, 0.87 mmol) is added and the mixture is stirred at room temperature for 5 hours. The mixture is quenched with water and extracted with ethyl acetate. The organic layer is washed with water, brine, dried over magnesium sulfate and filtered. The solvent is removed under reduced pressure to give (2R,4R)-7-biphenyl-4-ylmethyl-2,4-dimethyl-6-oxo-nonanedioic acid 9-tert-butyl ester 1-ethyl ester.

Provenance & Evidence