Pyridine → (S)-2-(tert-butoxycarbonylamino)-3-((R)-tetrahydro-2H-pyran-3-yl)propyl 4-methylbenzenesulfonate

HRID 451976Notes

Reaction equation

HRID 451976 reaction equation
[OH:1][CH2:2][C@@H:3]([NH:11][C:12](=[O:18])[O:13][C:14]([CH3:17])([CH3:16])[CH3:15])[CH2:4][C@H:5]1[CH2:10][CH2:9][CH2:8][O:7][CH2:6]1.N1C=CC=CC=1.[S:25](Cl)([C:28]1[CH:34]=[CH:33][C:31]([CH3:32])=[CH:30][CH:29]=1)(=[O:27])=[O:26]>C(Cl)Cl.CCOC(C)=O>[CH3:32][C:31]1[CH:33]=[CH:34][C:28]([S:25]([O:1][CH2:2][C@@H:3]([NH:11][C:12]([O:13][C:14]([CH3:15])([CH3:17])[CH3:16])=[O:18])[CH2:4][C@H:5]2[CH2:10][CH2:9][CH2:8][O:7][CH2:6]2)(=[O:27])=[O:26])=[CH:29][CH:30]=1

Participants

6

Reactant 3

HCID 1049Pyridine2×HCID 73974-Toluenesulfonyl chloride2×HCID 58011540tert-Butyl ((S)-1-hydroxy-3-((R)-tetrahydro-2H-pyran-3-yl)propan-2-yl)carbamate

Product 1

HCID 58011568(S)-2-(tert-butoxycarbonylamino)-3-((R)-tetrahydro-2H-pyran-3-yl)propyl 4-methylbenzenesulfonateYield 75%

Reagents, catalysts & solvents 2

HCID 6344DichloromethaneSolventHCID 8857Ethyl AcetateSolvent

Procedure

The above crude product tert-butyl (S)-1-hydroxy-3-((R)-tetrahydro-2H-pyran-3-yl)propan-2-ylcarbamate was dissolved in anhydrous DCM (22 mL). To this solution was added pyridine (2 mL) and TsCl (1.230 g, 6.45 mmol). After stirred at rt for 4 hr, another batch of pyridine (3 mL) and TsCl (0.700 g, 3.67 mmol) was added and stirred for another 12 hr. The reaction mixture was diluted with EtOAc (80 mL), washed with 1 N HCl (75 mL), followed by H2O (2×30 mL), saturated aq. NaHCO3, brine, and dried over anhydrous Na2SO4, and filtered, and concentrated under reduced pressure. The resulted slurry was purified through flash chromatography on silica gel (eluted with gradient system: 0-35% EtOAc in hexane) to afford (S)-2-(tert-butoxycarbonylamino)-3-((R)-tetrahydro-2H-pyran-3-yl)propyl 4-methylbenzenesulfonate, 670 mg, yield 75% for two steps. MS ESI +ve m/z 436 (M+Na).

Workup

  1. stirringstirred for another 12 hr
  2. washwashed with 1 N HCl (75 mL)
  3. dry with materialdried over anhydrous Na2SO4
  4. filtrationfiltered
  5. concentrationconcentrated under reduced pressure
  6. customThe resulted slurry was purified through flash chromatography on silica gel (eluted with gradient system: 0-35% EtOAc in hexane)

Sources & evidence

ORD record
ord-918198197e9e4f3cac5b1090e2ddab72
Source dataset
uspto-grants-2013_07
Patent number
US08487108B2

Reaction notes

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