Sodium Hydroxide → 4-((1R,3aS,5aR,5bR,7aR,11aS,11bR,13aR,13bR)-3a-((2-(4-(tert-butoxycarbonyl)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)benzoic acid

Participants

Reaction Conditions

Reaction Steps

A mixture of tert-butyl 4-(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]chrysen-3a-yl)amino)ethyl)piperazine-1-carboxylate (4 mg, 5.29 μmol) and sodium hydroxide (0.053 mL, 0.053 mmol) in dioxane (1 mL) was heated up at 80° C. for 3 hours. The reaction mixture was filtered and the clear solution was purified by HPLC to provide the desired product as white solid (1.6 mg, 39%). LCMS: m/e 742.65 (M−H)−, 2.68 min (method 10). 1H NMR (500 MHz, Acetic) δ 8.03 (d, J=8.2 Hz, 2H), 7.30 (d, J=8.2 Hz, 2H), 5.37 (d, J=4.6 Hz, 1H), 4.86 (s, 1H), 4.75 (s, 1H), 3.73 (br. s., 4H), 3.66-3.45 (m, 4H), 3.21 (br. s., 4H), 2.98-2.75 (m, 1H), 2.31-1.00 (m, 22H), 1.77 (s, 3H), 1.50 (s, 9H), 1.23 (s, 3H), 1.13 (s, 3H), 1.09 (s, 3H), 1.02 (s, 3H), 1.00 (s, 3H).

Provenance & Evidence