Tetrahydrofuran → HCID 50924852, compound

Participants

Reaction Steps

(1R,3aS,5aR,5bR,7aR,9S,11aR,11bR,13aR,13bR)-3a-(4-(hydroxymethyl)cyclopent-2-enylcarbamoyl)-5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)icosahydro-1H-cyclopenta[a]chrysen-9-yl acetate (Example 27, 0.22 g) in MeOH:THF (8:8 ml) and cooled the contents to 0° C. then sodium hydroxide (0.05 g in 4 ml water) was added and the contents were stirred for about 6 hours at room temperature then completion of the reaction was monitored by TLC. The reaction mixture was evaporated under reduced pressure, the residue was taken in water and extracted with DCM. The organic layer was dried over Na2SO4 and concentrated under reduced pressure. The residue was purified by silica gel column chromatography using 5% methanol in DCM as eluent to furnish the title compound (0.14 g) as a white solid. 1H NMR (300 MHz, CDCl3): 0.76-0.99 (m, 16H); 1.25-1.85 (m, 35H); 2.03-2.28 (m, 6H); 2.47 (s, 3H); 2.86-3.10 (m, 3H); 3.18 (s, 1H); 4.60 (s, 1H); 4.74 (s, 1H); ES Mass: 551 (100%), [M+1] 551; HPLC: 96.94%.

Provenance & Evidence