Diisopropylethylamine → methyl 4-((1R,3aS,5aR,5bR,7aR,11aS,11bR,13aR,13bR)-3a-((2-(4-(cyclopropylsulfonyl)piperazin-1-yl)ethyl)amino)-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

Participants

Reaction Conditions

Reaction Steps

To a solution of methyl 4-((1R,3aS,5aR,5bR,7aR,11aS,11bR,13aR,13bR)-5a,5b,8,8,11a-pentamethyl-3a-((2-(piperazin-1-yl)ethyl)amino)-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 (26 mg, 0.040 mmol) and Hunig's Base (0.035 mL, 0.198 mmol) in dichloromethane (1 mL) was added a solution of cyclopropanesulfonyl chloride (11.14 mg, 0.079 mmol) in dichloromethane (1 mL) at room temperature. The reaction mixture was stirred for 2 hours at 20° C. or LCMS indicated the formation of desired product and consumption of starting material. The reaction mixture was diluted with distilled water (4 mL), extracted with dichloromethane (3×4 mL), the extracts were combined, dried over sodium sulfate, filtered and concentrated under reduced pressure to provide the desired product as a yellow solid (30 mg, 100%). LCMS: m/e 760.61 (M+H)+, 2.40 min (method 11).

Provenance & Evidence