Triethylamine → (S)-tert-Butyl 4-((R)-2-(((tert-butyldimethylsilyl)oxy)methyl)-5-((methylsulfonyl)oxy)pentyl)-2,2-dimethyloxazolidine-3-carboxylate

HRID 218418

Reaction equation

HRID 218418 reaction equation
[Si:1]([O:8][CH2:9][C@H:10]([CH2:26][CH2:27][CH2:28][OH:29])[CH2:11][C@H:12]1[CH2:16][O:15][C:14]([CH3:18])([CH3:17])[N:13]1[C:19]([O:21][C:22]([CH3:25])([CH3:24])[CH3:23])=[O:20])([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].CCN(CC)CC.[CH3:37][S:38](Cl)(=[O:40])=[O:39]>C(Cl)Cl>[Si:1]([O:8][CH2:9][C@H:10]([CH2:26][CH2:27][CH2:28][O:29][S:38]([CH3:37])(=[O:40])=[O:39])[CH2:11][C@H:12]1[CH2:16][O:15][C:14]([CH3:18])([CH3:17])[N:13]1[C:19]([O:21][C:22]([CH3:25])([CH3:24])[CH3:23])=[O:20])([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2]

Participants

5

Reactant 3

HCID 8471TriethylamineHCID 31297Methanesulfonyl chlorideHCID 58011529(S)-tert-Butyl 4-((R)-2-(((tert-butyldimethylsilyl)oxy)methyl)-5-hydroxypentyl)-2,2-dimethyloxazolidine-3-carboxylate

Product 1

HCID 58011555(S)-tert-Butyl 4-((R)-2-(((tert-butyldimethylsilyl)oxy)methyl)-5-((methylsulfonyl)oxy)pentyl)-2,2-dimethyloxazolidine-3-carboxylateYield 100%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Procedure

To a solution of (S)-tert-butyl 4-((R)-2-((tert-butyldimethylsilyloxy)methyl)-5-hydroxypentyl)-2,2-dimethyloxazolidine-3-carboxylate (32 g, 74.2 mmol) and Et3N (22.5 g, 226 mmol) in CH2Cl2 (400 mL) was added a solution of MsCl (10.1 g, 89 mmol) in CH2Cl2 (50 mL) at 0-5° C. After addition, the reaction mixture was allowed to warm to rt and stir for 1 hr. The reaction was washed with water (200 mL) and the aqueous layer was extracted with CH2Cl2 (3×150 mL). The combined organic layers was washed with 10% citric acid (60 mL), sat. NaHCO3 (60 mL) and brine (100 mL), then dried over Na2SO4, filtered and concentrated to give (S)-tert-butyl 4-((R)-2-((tert-butyldimethylsilyloxy)methyl)-5-(methylsulfonyloxy)pentyl)-2,2-dimethyloxazolidine-3-carboxylate (37.7 g, 100%), which was used in the next step without purification.

Workup

  1. additionAfter addition
  2. washThe reaction was washed with water (200 mL)
  3. extractionthe aqueous layer was extracted with CH2Cl2 (3×150 mL)
  4. washThe combined organic layers was washed with 10% citric acid (60 mL), sat. NaHCO3 (60 mL) and brine (100 mL)
  5. dry with materialdried over Na2SO4
  6. filtrationfiltered
  7. concentrationconcentrated

Sources & evidence

ORD record
ord-aa7ad685228b48ef9b04e244f4bc18e6
Source dataset
uspto-grants-2012_06
Patent number
US08198453B2

Linked notes

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