3,3-Dimethylglutaric anhydride → HCID 66858755, compound

Participants

Reaction Steps

To a stirred solution of (1R,3aS,5aR,5bR,7aR,9S,11aR,11bR,13aR,13bR)-N-((1R,3S)-3-((4-benzylpiperidin-1-yl)methyl)cyclopentyl)-9-hydroxy-5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)icosahydro-1H-cyclopenta[a]chrysene-3a-carboxamide (Example 32, 0.5 g, 0.80 mmol) in pyridine (5 ml), dimethyl amino pyridine (0.2 g, 1.6 mmol) was added, followed by 4,4-dimethyldihydro-2H-pyran-2,6(3H)-dione (0.82 ml) was added. The contents were refluxed for 16 hours. After completion of the reaction (monitored by TLC), the reaction mixture was diluted with ethyl acetate (30 ml). The organic layer was washed with 5% aqueous HCl, water followed by brine, dried over Na2SO4 and concentrated under reduced pressure. The residue was purified by silica gel column chromatography using 5% MeOH in DCM as eluent to furnish the title compound (0.25 g) as a white solid. 1H NMR (300 MHz, CDCl3): 0.80-0.95 (m, 17H); 1.14-1.67 (m, 23H); 1.82-2.02 (m, 15H); 2.23-3.50 (m, 15H); 4.21-4.45 (m, 2H); 4.57 (s, 1H); 4.72 (s, 1H); 6.28-6.30 (m, 1H); 7.11-7.13 (m, 2H); 7.14-7.22 (m, 1H); 7.24-7.29 (m, 2H); ES Mass: 841 (100%), [M+1].

Provenance & Evidence