Potassium Carbonate → {[2-[(3,5-Dimethoxy-4-methyl-benzoylamino)-methyl]-5-(5-methyl-[1,2,4]oxadiazol-3-yl)-phenyl]-phenethyl-amino}-acetic acid

Participants

Reaction Conditions

Reaction Steps

A solution of compound 9a (45 mg, 0.092 mmol), methyl bromoacetate (0.053 mL, 0.56 mmol), and potassium carbonate (38 mg, 0.27 mmol) in DMF (1 mL) was sealed in a pressure tube and heated at 80° C. overnight and at rt for two days. Additional methyl bromoacetate (0.060 mL) and potassium carbonate (42 mg) was added and the reaction was heated at 100° C. for 5 h. The reaction mixture was filtered and concentrated on a rotary evaporator. The residue was purified by preparative tlc. This compound was dissolved in a mixture of THF (1 mL) containing several drops of MeOH and 10% LiOH (1 mL). The reaction mixture was stirred at rt for 4 h, neutralized, and concentrated on a rotary evaporator. The residue was dissolved in ethyl acetate, washed with water, dried, and concentrated to give compound 22a (31 mg, 62%). ESI-MS m/e 545.4 (M+1).

Provenance & Evidence