Benzyl Bromide → 28-O-benzyldihydrobetulinic acid

HRID 2405501Notes

Reaction equation

HRID 2405501 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]([CH:24]([CH3:26])[CH3:25])[C@@H:12]32)[C:3]1([CH3:33])[CH3:32].C(=O)([O-])[O-].[K+].[K+].Br[CH2:41][C:42]1[CH:47]=[CH:46][CH:45]=[CH:44][CH:43]=1>CN(C=O)C>[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]([O:29][CH2:41][C:42]4[CH:47]=[CH:46][CH:45]=[CH:44][CH:43]=4)=[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

5

Reactant 3

HCID 7498Benzyl BromideHCID 11430Potassium CarbonateHCID 65319Dihydrobetulinic Acid

Product 1

HCID 46740128-O-benzyldihydrobetulinic acidYield 92%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Conditions

Temperature
60 °C

Procedure

To a solution of (1S,3aS,5aR,5bR,7aR,9S,11aR,11bR,13aR,13bR)-9-hydroxy-1-isopropyl-5a,5b,8,8,11a-pentamethylicosahydro-1H-cyclopenta[a]chrysene-3a-carboxylic acid (3 g, 6.54 mmol) and potassium carbonate (1.808 g, 13.08 mmol) in DMF (60 mL) was added (bromomethyl)benzene (0.816 mL, 6.87 mmol). The reaction mixture was heated up to 60° C. for 3 h. LCMS indicated the starting material was consumed. The reaction mixture was quenched with 60 ml water, a white precipitate was observed. The white solid was collected through filtration and washed with distilled water. The solid was dried in the air to provide the title compound as white solid (3.3 g, 92%). 1H NMR (500 MHz, CHLOROFORM-d) δ ppm 7.42-7.28 (m, 5H), 5.27-5.01 (m, 2H), 3.18 (dt, J=11.22, 5.53 Hz, 1H), 2.40-2.09 (m, 3H), 1.91-1.73 (m, 2H), 1.72-0.78 (m, 21H), 0.95 (s, 3H), 0.91 (s, 3H), 0.84 (d, J=7.02 Hz, 3H), 0.80 (s, 3H), 0.75 (s, 3H), 0.73 (s, 3H), 0.73 (d, J=6.71 Hz, 3H).

Workup

  1. customwas consumed
  2. customThe reaction mixture was quenched with 60 ml water
  3. filtrationThe white solid was collected through filtration
  4. washwashed with distilled water
  5. customThe solid was dried in the air

Sources & evidence

ORD record
ord-fb6810f2fe6a4f539755cfd288704952
Source dataset
uspto-grants-2014_08
Patent number
US08802661B2

Reaction notes

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