Tetrabutylammonium Fluoride → HCID 10053347, compound

HRID 1604615Notes

Reaction equation

HRID 1604615 reaction equation
[CH2:1]([O:8][C@@H:9]1[CH2:38][C@@H:37]2[C@:32]([CH3:46])([CH2:33][CH2:34][C@H:35]([O:39][CH:40]3[CH2:45][CH2:44][CH2:43][CH2:42][O:41]3)[CH2:36]2)[C@@H:31]2[C@@H:10]1[C@H:11]1[C@:28]([CH3:47])([CH2:29][CH2:30]2)[C@@H:14]([C@H:15]([CH3:27])[CH2:16][CH2:17][CH2:18][O:19][Si](C(C)(C)C)(C)C)[CH2:13][CH2:12]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[F-].C([N+](CCCC)(CCCC)CCCC)CCC>C1COCC1>[CH2:1]([O:8][C@@H:9]1[CH2:38][C@@H:37]2[C@:32]([CH3:46])([CH2:33][CH2:34][C@H:35]([O:39][CH:40]3[CH2:45][CH2:44][CH2:43][CH2:42][O:41]3)[CH2:36]2)[C@@H:31]2[C@@H:10]1[C@H:11]1[C@:28]([CH3:47])([CH2:29][CH2:30]2)[C@@H:14]([C@H:15]([CH3:27])[CH2:16][CH2:17][CH2:18][OH:19])[CH2:13][CH2:12]1)[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1

Participants

4

Reactant 2

HCID 2724141Tetrabutylammonium FluorideHCID 10462082HCID 10462082, compound

Product 1

HCID 10053347HCID 10053347, compoundYield 90.4%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

Compound 2007 (0.0527 g, 0.079 mmol) in anhydrous THF (4 ml) under Ar was treated with tetrabutylammonium fluoride (TBAF) (0.237 ml, 1M in THF, 0.237 mmol). The solution was stirred until no starting material remained by TLC. The solvent was removed in vacuo, the residue taken up in 5 ml CH2Cl2, washed with 5 ml aqueous saturated NaHCO3 solution, and the aqueous layer was extracted 2× with 5 ml CH2Cl2. The combined organic layers were dried over anhydrous MgSO4, filtered, and the solvent removed in vacuo. Flash chromatography (SiO2, 8:1 hexanes:EtOAc) gave compound 2008 (0.0395 g, 90%) as a white solid foam. 1H NMR (500 MHz, CDCl3) δ: 7.35-7.34 (m, 5H, benzyl Ar-H), 4.71-4.69 (m, 1H, THP ether methine H), 4.585 (d, J=11.8 Hz, 1/2H, benzyl-CH2), 4.58 (d, J=11.8 Hz, 1/2H, benzyl-CH2), 4.315 (d, J=12.0 Hz, 1/2H, benzyl-CH2), 4.29 (d, J=12.0 Hz, 1/2H, benzyl-CH2), 3.94-3.90 (m, 1H, THP OCH2), 3.62-3.58 (m, 3H, C-24 H & THP OCH2), 3.50-3.48 (m, 1H, C-3 H), 3.45 (s, 1H, 7-H), 0.92 (d, J=6.6 Hz, 3H, C-21 H), 0.81 (s, 3H, C-19 H), 0.63 (s, 3H, C-18 H) (Note: product is a mixture of diastereomers); IR (CHCl3) 3600, 2900 cm-1 ; MS (CI/isobutane) m/z 554 (M+1, 2%), 361 (M+1-THP-HOBn, 42%), 343 (M+1-THP-HPBn, H2O, 100%); m.p. 52-56° C.; Anal. calcd. for C36H56O4 : C=78.21, H=10.21; Found: C=77.93, H=10.39.

Workup

  1. customThe solvent was removed in vacuo
  2. washwashed with 5 ml aqueous saturated NaHCO3 solution
  3. extractionthe aqueous layer was extracted 2× with 5 ml CH2Cl2
  4. dry with materialThe combined organic layers were dried over anhydrous MgSO4
  5. filtrationfiltered
  6. customthe solvent removed in vacuo

Sources & evidence

ORD record
ord-552d79f19c2f4966862b50e7b05fbbb4
Source dataset
uspto-grants-1999_11
Patent number
US05994336

Reaction notes

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