1-Hydroxybenzotriazole → (3S,8S)-3-[3-(3,4-Dichloro-benzyloxy)-phenyl]-8-{(S)-2-[4-(2,3-dimethyl-pyridin-4-yloxy)-phenyl]-1-methoxycarbonyl-ethylcarbamoyl}-2,3,8,9-tetrahydro-6H-[1,4]dioxino[2,3-g]isoquinoline-7-carboxylic acid tert-butyl ester

Participants

Reaction Conditions

Reaction Steps

(3S,8S)-3-[3-(3,4-Dichloro-benzyloxy)-phenyl]-2,3,8,9-tetrahydro-6H-[1,4]dioxino[2,3-g]isoquinoline-7,8-dicarboxylic acid 7-tert-butyl ester (80 mg) was taken up in 2 mL of anhydrous DCM and EDCI (34 mg), HOBT (25 mg) and (S)-2-amino-3-[4-(2,3-dimethyl-pyridin-4-yloxy)-phenyl]-propionic acid methyl ester dihydrochloride (50 mg) were added and stirred for minutes. The reaction mixture was cooled to 0° C. and DIEA (85 mg) was added and reaction was stirred at room temperature for 2 hours. After the reaction was complete, it was purified by column chromatography (silica gel; 1:3 ethyl acetate/hexanes to 4% MeOH in 1:1 ethyl acetate/hexanes) (70 mg). LCMS (m/z): 869.

Provenance & Evidence