4-Toluenesulfonyl chloride → ((1S,2S,3R,4R)-2-(3-(benzyloxy)benzyl)-4-(tert-butyldimethylsilyoxy)-3-((S,E)-3-(tert-butyldimethylsilyoxy)oct-1-enyl)cyclopentyl)methyl 4-methylbenzenesulfonate

HRID 39611Notes

Reaction equation

HRID 39611 reaction equation
[CH2:1]([O:8][C:9]1[CH:10]=[C:11]([CH:44]=[CH:45][CH:46]=1)[CH2:12][C@@H:13]1[C@@H:17](/[CH:18]=[CH:19]/[C@@H:20]([O:26][Si:27]([C:30]([CH3:33])([CH3:32])[CH3:31])([CH3:29])[CH3:28])[CH2:21][CH2:22][CH2:23][CH2:24][CH3:25])[C@H:16]([O:34][Si:35]([C:38]([CH3:41])([CH3:40])[CH3:39])([CH3:37])[CH3:36])[CH2:15][C@@H:14]1[CH2:42][OH:43])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.C(N(CC)CC)C.[C:54]1([CH3:64])[CH:59]=[CH:58][C:57]([S:60](Cl)(=[O:62])=[O:61])=[CH:56][CH:55]=1.C(=O)(O)[O-].[Na+]>C(Cl)Cl>[CH3:64][C:54]1[CH:59]=[CH:58][C:57]([S:60]([O:43][CH2:42][C@H:14]2[CH2:15][C@@H:16]([O:34][Si:35]([C:38]([CH3:41])([CH3:40])[CH3:39])([CH3:37])[CH3:36])[C@H:17](/[CH:18]=[CH:19]/[C@@H:20]([O:26][Si:27]([C:30]([CH3:31])([CH3:32])[CH3:33])([CH3:28])[CH3:29])[CH2:21][CH2:22][CH2:23][CH2:24][CH3:25])[C@H:13]2[CH2:12][C:11]2[CH:44]=[CH:45][CH:46]=[C:9]([O:8][CH2:1][C:2]3[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=3)[CH:10]=2)(=[O:62])=[O:61])=[CH:56][CH:55]=1

Participants

6

Reactant 4

HCID 73974-Toluenesulfonyl chlorideHCID 8471TriethylamineHCID 516892Sodium BicarbonateHCID 86677380((1S,2S,3R,4R)-2-(3-(benzyloxy)benzyl)-4-(ter-butyldimethylsilyoxy)-3-((S,E)-3-(tert-butyldimethylsilyoxy)oct-1-enyl)cyclopentyl)methanol

Product 1

HCID 86677379((1S,2S,3R,4R)-2-(3-(benzyloxy)benzyl)-4-(tert-butyldimethylsilyoxy)-3-((S,E)-3-(tert-butyldimethylsilyoxy)oct-1-enyl)cyclopentyl)methyl 4-methylbenzenesulfonateYield 85%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

A solution of ((1S,2S,3R,4R)-2-(3-(benzyloxy)benzyl)-4-(tert-butyldimethylsilyoxy)-3-((S,E)-3-(tert-butyl dimethylsilyoxy)oct-1-enyl)cyclopentyl)methanol (15 g, 0.023 mol) in dry CH2Cl2 (500 ml) was cooled to 0° C. under nitrogen and treated with triethylamine (9.6 ml, 0.068 mol), then with p-Toluenesulfonic chloride (8.77 g, 0.046 mol). The mixture was poured to saturated sodium bicarbonate aqueous and stirred for 30 minutes. The reaction mixture was phase separated and the aqueous layer was extracted with 500 ml ethyl acetate. The organic layers were combined and dried over anhydrous magnesium sulfate. The solid was filtered off. The solvent was evaporated off under vacuum. The crude product was purified by chromatography on silica gel using a mixture of hexane and ethyl acetate as a gradient eluent. Yield: 85%.

Workup

  1. customseparated
  2. extractionthe aqueous layer was extracted with 500 ml ethyl acetate
  3. dry with materialdried over anhydrous magnesium sulfate
  4. filtrationThe solid was filtered off
  5. customThe solvent was evaporated off under vacuum
  6. customThe crude product was purified by chromatography on silica gel using
  7. additiona mixture of hexane and ethyl acetate as a gradient eluent

Sources & evidence

ORD record
ord-63bbe6edf3d947208757a0e9e57fee3c
Source dataset
uspto-grants-2013_09
Patent number
US08524939B2

Reaction notes

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