Triphenylphosphine → methyl 3-((1S)-2-{[tert-butyl(dimethyl)silyl]oxy}-1-methylethoxy)-5-[4-(methylsulfonyl)phenoxy]benzoate

HRID 2355008Notes

Reaction equation

HRID 2355008 reaction equation
[O:1]([CH2:9][C@H:10]([OH:12])[CH3:11])[Si:2]([C:5]([CH3:8])([CH3:7])[CH3:6])([CH3:4])[CH3:3].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.[CH3:32][O:33][C:34](=[O:53])[C:35]1[CH:40]=[C:39](O)[CH:38]=[C:37]([O:42][C:43]2[CH:48]=[CH:47][C:46]([S:49]([CH3:52])(=[O:51])=[O:50])=[CH:45][CH:44]=2)[CH:36]=1.N(C(OCC)=O)=NC(OCC)=O>O1CCCC1.C1(C)C=CC=CC=1>[CH3:32][O:33][C:34](=[O:53])[C:35]1[CH:40]=[C:39]([O:12][C@@H:10]([CH3:11])[CH2:9][O:1][Si:2]([C:5]([CH3:7])([CH3:8])[CH3:6])([CH3:4])[CH3:3])[CH:38]=[C:37]([O:42][C:43]2[CH:48]=[CH:47][C:46]([S:49]([CH3:52])(=[O:50])=[O:51])=[CH:45][CH:44]=2)[CH:36]=1

Participants

7

Reactant 4

HCID 11776TriphenylphosphineHCID 220568ethyl N-ethoxycarbonyliminocarbamateHCID 13175135(2R)-1-{[(1,1-Dimethylethyl)(dimethyl)silyl]oxy}propan-2-olHCID 46941846Methyl 3-hydroxy-5-(4-(methylsulfonyl)phenoxy)benzoate

Product 1

HCID 59346872methyl 3-((1S)-2-{[tert-butyl(dimethyl)silyl]oxy}-1-methylethoxy)-5-[4-(methylsulfonyl)phenoxy]benzoate

Reagents, catalysts & solvents 2

HCID 1140TolueneSolventHCID 8028TetrahydrofuranSolvent

Procedure

After then adding 11.8 g (62.1 mmol) of (2R)-1-(t-butyldimethylsiloxy)-2-hydroxypropane and 16.3 g (62.1 mmol) of triphenylphosphine to a solution of 10.0 g (31.0 mmol) of the obtained 5-hydroxy-3-(4-methanesulfonyl-phenoxy)benzoic acid methyl ester in tetrahydrofuran (200 ml), 33.8 ml (77.6 mmol) of a solution of diethyl azodicarboxylate in 40% toluene was added while cooling on ice, and the mixture was stirred at room temperature for 12 hours. The reaction mixture was concentrated under reduced pressure, and the obtained residue was purified by silica gel column chromatography (hexane:acetic acid ethyl ester=8:2) to obtain 5-((1S)-2-(tert-butyldimethylsiloxy)-1-methyl-ethoxy)-3-(4-methanesulfonyl-phenoxy)-benzoic acid methyl ester as a yellow oil.

Workup

  1. additionwas added
  2. temperaturewhile cooling on ice
  3. concentrationThe reaction mixture was concentrated under reduced pressure
  4. customthe obtained residue was purified by silica gel column chromatography (hexane:acetic acid ethyl ester=8:2)

Sources & evidence

ORD record
ord-01bc61f8560e4265ba364b8b86351b72
Source dataset
uspto-grants-2010_07
Patent number
US07754743B2

Reaction notes

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