Betulinic Acid → Dihydrobetulinic Acid

Reaction equation

[OH:1][C@H:2]1[CH2:19][CH2:18][C@@:17]2([CH3:20])[C@@H:4]([CH2:5][CH2:6][C@:7]3([CH3:31])[C@@H:16]2[CH2:15][CH2:14][C@H:13]2[C@@:8]3([CH3:30])[CH2:9][CH2:10][C@@:11]3([C:27]([OH:29])=[O:28])[CH2:23][CH2:22][C@@H:21]([C:24]([CH3:26])=[CH2:25])[C@@H:12]32)[C:3]1([CH3:33])[CH3:32]>C(OCC)(=O)C.CO.[Pd]>[OH:1][C@H:2]1[CH2:19][CH2:18][C@@:17]2([CH3:20])[C@@H:4]([CH2:5][CH2:6][C@:7]3([CH3:31])[C@@H:16]2[CH2:15][CH2:14][C@H:13]2[C@@:8]3([CH3:30])[CH2:9][CH2:10][C@@:11]3([C:27]([OH:29])=[O:28])[CH2:23][CH2:22][C@@H:21]([CH:24]([CH3:26])[CH3:25])[C@@H:12]32)[C:3]1([CH3:32])[CH3:33]

Participants

Procedure

A mixture of (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-carboxylic acid (4 g, 8.76 mmol) and 10% Pd/C (1.398 g, 1.314 mmol) in ethyl acetate (80 mL) and MeOH (30 mL) was connected to Parr Shaker and shaked for 18 h under 45 psi at room temperature. LCMS indicated the formation of desired product. The reaction mixture was filtered through celite and the filtrates were concentrated under reduced pressure to give the title compound as white solid (3 g, 75%). LCMS: m/e 457.27 (M−H)−, 2.40 min (method 1).