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Pyridine → (1S,3S,4S)-3-[(benzyloxy)methyl]-4-{[tert-butyl(dimethyl)silyl]oxy}cyclopentyl methanesulfonate

HRID 447610
Notes
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Reaction equation

HRID 447610 reaction equation
[CH2:1]([O:8][CH2:9][C@H:10]1[C@@H:14]([O:15][Si:16]([C:19]([CH3:22])([CH3:21])[CH3:20])([CH3:18])[CH3:17])[CH2:13][C@@H:12]([OH:23])[CH2:11]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.N1C=CC=CC=1.[CH3:30][S:31](Cl)(=[O:33])=[O:32]>C(Cl)Cl.CN(C1C=CN=CC=1)C>[CH3:30][S:31]([O:23][C@@H:12]1[CH2:13][C@H:14]([O:15][Si:16]([C:19]([CH3:20])([CH3:22])[CH3:21])([CH3:18])[CH3:17])[C@H:10]([CH2:9][O:8][CH2:1][C:2]2[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=2)[CH2:11]1)(=[O:33])=[O:32]
ParticipantsConditionsProcedureWorkupSources & evidenceReaction notes

Participants

6

Reactant 3

HCID 1049PyridineHCID 31297Methanesulfonyl chloride2×HCID 66798092(1S,3S,4S)-3-[(benzyloxy)methyl]-4-{[tert-butyl(dimethyl)silyl]oxy}cyclopentanol

Product 1

HCID 86618711(1S,3S,4S)-3-[(benzyloxy)methyl]-4-{[tert-butyl(dimethyl)silyl]oxy}cyclopentyl methanesulfonateYield 55.3%

Reagents, catalysts & solvents 2

HCID 14284
4-(Dimethylamino)pyridine
Catalyst
2×
HCID 6344DichloromethaneSolvent

Conditions

Temperature
23 °C

Procedure

To a stirred solution of (1S,3S,4S)-3-[(benzyloxy)methyl]-4-{[tert-butyl(dimethyl)silyl]oxy}cyclopentanol (2.04 g, 0.00606 mol) in CH2Cl2 (96 mL) was added pyridine (2.4 mL, 0.030 mol), DMAP (100 mg, 0.001 mol), and methanesulfonyl chloride (700 μL, 0.0091 mol) under an atmosphere of nitrogen, The mixture was stirred 23° C. for 45 minutes, then warmed to 40° C. for 3 hours. To the reaction was added DMAP (100 mg, 0.001 mol) and methanesulfonyl chloride (700 μL, 0.0091 mol). After stirring for 40 min, the reaction was cooled then concentrated in vacuo. The residue was purified by flash chromatography (0 to 15% EtOAc/hexanes) to obtain 1.39 g (55%) of the title compound as one diastereomer (separated undesired diastereomer from step a).

Workup

  1. temperaturewarmed to 40° C. for 3 hours
  2. stirringAfter stirring for 40 min
  3. temperaturethe reaction was cooled
  4. concentrationthen concentrated in vacuo
  5. customThe residue was purified by flash chromatography (0 to 15% EtOAc/hexanes)

Sources & evidence

ORD record
ord-6806f51381604367a214a6f7893ab0c5
Source dataset
uspto-grants-2013_07
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US08481550B2

Reaction notes

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On this pageParticipantsConditionsProcedureWorkupSources & evidenceReaction notes