Cholesterol → Cholest-5-en-3-ol (3beta)-, 3-methanesulfonate

HRID 219296Notes

Reaction equation

HRID 219296 reaction equation
[CH3:1][CH:2]([CH2:4][CH2:5][CH2:6][C@H:7]([C@@H:9]1[C@:27]2([CH3:28])[C@H:12]([C@H:13]3[C@H:24]([CH2:25][CH2:26]2)[C@:22]2([CH3:23])[C:16]([CH2:17][C@H:18]([CH2:20][CH2:21]2)[OH:19])=[CH:15][CH2:14]3)[CH2:11][CH2:10]1)[CH3:8])[CH3:3].C(N(CC)CC)C.[CH3:36][S:37](Cl)(=[O:39])=[O:38]>C(Cl)Cl>[CH3:36][S:37]([O:19][C@H:18]1[CH2:20][CH2:21][C@@:22]2([CH3:23])[C:16](=[CH:15][CH2:14][C@@H:13]3[C@@H:24]2[CH2:25][CH2:26][C@@:27]2([CH3:28])[C@H:12]3[CH2:11][CH2:10][C@@H:9]2[C@H:7]([CH3:8])[CH2:6][CH2:5][CH2:4][CH:2]([CH3:1])[CH3:3])[CH2:17]1)(=[O:39])=[O:38]

Participants

5

Reactant 3

HCID 5997CholesterolHCID 8471TriethylamineHCID 31297Methanesulfonyl chloride

Product 1

HCID 102403Cholest-5-en-3-ol (3beta)-, 3-methanesulfonateYield 99%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Conditions

Temperature
4 °C

Procedure

A solution of cholesterol (19.3 g, 50.0 mmol) in anhydrous CH2Cl2 (250 mL) was cooled to 4° C. by ice-water bath. To this solution, triethylamine (13.9 mL, 100.0 mmol) was added, followed by the dropwise addition of methanesulfonyl chloride (4.3 mL, 55 mmol) in anhydrous CH2Cl2 (50 mL). The reaction was maintained at 4° C. and stirred for 3 h. When the cholesterol was consumed as analyzed by TLC (hexanes/ethyl acetate, 5:1), the solvent was removed in vacuo. The resulting residue was redissolved in CH2Cl2 (15 mL), the product was precipitated by addition of MeOH (150 mL), and the product collected by vacuum filtration. The solid was washed with MeOH (30 mL) and dried under vacuum to yield the product (23.0 g, 99.0%) as a white solid, mp 119-120° C.; 1H NMR (300 MHz, CDCl3) δ 5.41 (s, 1H), 4.56-4.45 (m, 1H), 3.00 (s, 3H), 2.57-2.43 (m, 2H), 2.04-0.81 (m, 38H), 0.67 (s, 3H); 13C NMR (75 MHz, CDCl3) δ 138.6, 123.7, 81.9, 56.5, 56.0, 49.9, 42.2, 39.6, 39.4, 39.1, 38.7, 36.8, 36.3, 36.1, 35.7, 31.8, 31.7, 28.9, 28.1, 27.9, 24.2, 23.8, 22.8, 22.5, 20.9, 19.1, 18.6, 11.8; IR (film) ν max 3029, 2944, 2908, 2861, 1468, 1440, 1415, 1353, 1330, 1173 cm−1; ESI+ m/z ((MNa)+ 487.3237, C28H48O3SNa requires 487.3222).

Workup

  1. customWhen the cholesterol was consumed
  2. customthe solvent was removed in vacuo
  3. dissolutionThe resulting residue was redissolved in CH2Cl2 (15 mL)
  4. customthe product was precipitated by addition of MeOH (150 mL)
  5. filtrationthe product collected by vacuum filtration
  6. washThe solid was washed with MeOH (30 mL)
  7. customdried under vacuum

Sources & evidence

ORD record
ord-6452eaf131374856b9c510fd40f21c70
Source dataset
uspto-grants-2012_06
Patent number
US08198230B2

Reaction notes

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