Tetrahydrofuran → HCID 66858586, compound

Participants

Reaction Steps

Ethyl 4-((1R,3aS,5aR,5bR,7aR,9S,11aR,11bR,13aR,13bR)-9-acetoxy-5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)icosahydro-1H-cyclopenta[a]chrysene-3a-carbonyl)-1-benzylcyclohexanecarboxylate (Example 55, 0.9 g) was taken in MeOH:THF (8:8 ml) and cooled the contents to 0° C. then sodium hydroxide (0.28 g in 4 ml water) was added and stirred for about 6 hours at room temperature. Completion of the reaction was monitored by TLC. The reaction mixture was evaporated under reduced pressure and the residue was taken in water, extracted with DCM, 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 (0.45 g) as a white solid. 1H NMR (300 MHz, CDCl3): 0.57-0.97 (m, 19H); 1.18-1.21 (m, 8H); 1.25-1.41 (m, 12H); 1.49-1.62 (m, 8H); 1.65-1.82 (m, 10H); 1.85-1.98 (m, 4H); 2.56-2.69 (m, 2H); 3.29-3.38 (m, 1H); 3.89-3.90 (m, 1H); 4.12-4.23 (m, 2H) 4.56 (s, 1H); 4.71 (s, 1H); 7.03-7.05 (m, 2H); 7.23-7.25 (m, 3H); MASS: 685 (100%).

Provenance & Evidence