Sodium Carbonate → methyl 5-((1R,3aS,5aR,5bR,7aR,11aS,11bR,13aR,13bR)-3a-(2-(dimethylamino)ethylcarbamoyl)-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)thiophene-2-carboxylate

Participants

Reaction Conditions

Reaction Steps

A mixture of (1R,3aS,5aR,5bR,7aR,11aR,13aR,13bR)-3a-(2-(dimethylamino)ethylcarbamoyl)-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 trifluoromethanesulfonate (100 mg, 0.152 mmol), 5-(methoxycarbonyl)thiophen-2-ylboronic acid (36 mg, 0.228 mmol), tetrakis(triphenylphosphine)palladium(0) (5.2 mg, 0.0045 mmol) and sodium carbonate (48 mg, 0.456 mmol) in water (1 mL) and DME (1 mL) was heated up at 90° C. for 2 hours. The reaction mixture was quenched with distilled water, extracted with ethyl acetate (3×5 mL), the extracts were combined, dried over sodium sulfate, filtered and concentrated under reduced pressure to provide the desired product as a brown oil (60 mg, 32%). LCMS: m/e 647.63 (M−H)−, 2.67 min (method 1).

Provenance & Evidence