Potassium Carbonate → dimethyl 2,2'-(2-((1R,3aS,5aR,5bR,7aR,11aS,11bR,13aR,13bR)-9-(4-(methoxycarbonyl)phenyl)-5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)-2,3,3a,4,5,5a,5b,6,7,7a,8,11,11a,11b,12,13,13a,13b-octadecahydro-1H-cyclopenta[a]chrysene-3a-carboxamido)ethylazanediyl)diacetate

Participants

Reaction Conditions

Reaction Steps

To a solution of methyl 4-((1R,3aS,5aR,5bR,7aR,11aS,11bR,13aR,13bR)-3a-(2-aminoethylcarbamoyl)-5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)-2,3,3a,4,5,5a,5b,6,7,7a,8,11,11a,11b,12,13,13a,13b-octadecahydro-1H-cyclopenta[a]chrysen-9-yl)benzoate (20 mg, 0.033 mmol) in acetonitrile (1 mL) and dioxane (1 mL) was added methyl 2-bromoacetate (14.93 mg, 0.098 mmol) and potassium carbonate (22.48 mg, 0.163 mmol). The reaction mixture was heated up at 78° C. for 3 hours. LCMS indicated the formation of desired product and consumption of starting material. The reaction mixture was quenched with distilled water, extracted with DCM (3×3 mL). All the extracts were combined, dried over sodium sulfate, filtered and concentrated under reduced pressure to provide the desired product (17 mg, 69%) as white solid. LCMS: m/e 759.7 (M+H)+, 2.88 min (method 1).

Provenance & Evidence