Tetrahydrofuran → HCID 50924701, compound

Participants

Reaction Steps

Tert-butyl 2-(6-(2-((1R,3aS,5aR,5bR,7aR,9S,11aR,11bR,13aR,13bR)-9-hydroxy-5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)icosahydro-1H-cyclopenta[a]chrysene-3a-carboxamido)ethyl)-2,2-dimethyl-1,3-dioxan-4-yl)acetate (Example 78, 2.0 g) was taken in MeOH:THF (8:8 ml) and cooled the contents to 0° C. then sodium hydroxide (1.5 g in 4 ml water) was added and contents were stirred for 6 hours at room temperature. Completion of the reaction was monitored by TLC, reaction mixture was evaporated under reduced pressure and 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 (1.45 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, 10H); 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); 4.15-4.18 (m, 2H); 4.56 (s, 1H); 4.71 (s, 1H); MASS: 712 (100%).

Provenance & Evidence