Triethylamine → 2-But-3-enyloxy-3-{3,5-dimethyl-4-[2-(5-methyl-2-phenyl-oxazol-4-yl)-ethoxy]-phenyl}-3-methanesulfonyloxy-propionic acid ethyl ester

HRID 479224Notes

Reaction equation

HRID 479224 reaction equation
[CH2:1]([O:3][C:4](=[O:36])[CH:5]([O:31][CH2:32][CH2:33][CH:34]=[CH2:35])[CH:6]([C:8]1[CH:13]=[C:12]([CH3:14])[C:11]([O:15][CH2:16][CH2:17][C:18]2[N:19]=[C:20]([C:24]3[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=3)[O:21][C:22]=2[CH3:23])=[C:10]([CH3:30])[CH:9]=1)[OH:7])[CH3:2].C(N(CC)CC)C.[CH3:44][S:45](Cl)(=[O:47])=[O:46]>ClCCl>[CH2:1]([O:3][C:4](=[O:36])[CH:5]([O:31][CH2:32][CH2:33][CH:34]=[CH2:35])[CH:6]([C:8]1[CH:13]=[C:12]([CH3:14])[C:11]([O:15][CH2:16][CH2:17][C:18]2[N:19]=[C:20]([C:24]3[CH:25]=[CH:26][CH:27]=[CH:28][CH:29]=3)[O:21][C:22]=2[CH3:23])=[C:10]([CH3:30])[CH:9]=1)[O:7][S:45]([CH3:44])(=[O:47])=[O:46])[CH3:2]

Participants

5

Reactant 3

HCID 8471TriethylamineHCID 31297Methanesulfonyl chlorideHCID 695565242-But-3-enyloxy-3-{3,5-dimethyl-4-[2-(5-methyl-2-phenyl-oxazol-4-yl)-ethoxy]-phenyl}-3-hydroxy-propionic acid ethyl ester

Product 1

HCID 865874782-But-3-enyloxy-3-{3,5-dimethyl-4-[2-(5-methyl-2-phenyl-oxazol-4-yl)-ethoxy]-phenyl}-3-methanesulfonyloxy-propionic acid ethyl ester

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To a solution of 2-but-3-enyloxy-3-{3,5-dimethyl-4-[2-(5-methyl-2-phenyl-oxazol-4-yl)-ethoxy]-phenyl}-3-hydroxy-propionic acid ethyl ester (150 mg, 0.3 mmol) in dichloromethane (2 ml) at 0° C. was added successively triethylamine (55 μl, 0.4 mmol) and methanesulfonic acid chloride (42 μl, 0.36 mmol). The reaction was allowed to warm to ambient temperature over night and then quenched by the addition of sat. NaHCO3. The layers were separated and the aqueous phase was extracted two times with dichloromethane. The combined organic layers were dried over sodium sulfate and concentrated in vacuo to afford crude 2-but-3-enyloxy-3-{3,5-dimethyl-4-[2-(5-methyl-2-phenyl-oxazol-4-yl)-ethoxy]-phenyl}-3-methanesulfonyloxy-propionic acid ethyl ester which was dissolved in THF (2 ml). DBU (139 μl, 0.9 mmol) was added at ambient temperature and the mixture was stirred for 8 h at 50° C. The reaction was quenched by the addition of water, the layers were separated, and the aqueous phase was extracted two times with dichloromethane. The combined organic layers were dried over sodium sulfate, and the solvent was removed under reduced pressure to afford a brown oil which was purified by column chromatography (silica gel, hexane/AcOEt=9/1) to give 79 mg (0.166 mmol, 55%) of the title compound as bright yellow oil and 29 mg (61 μmol, 20%) 2E-but-3-enyloxy-3-{3,5-dimethyl-4-[2-(5-methyl-2-phenyl-oxazol-4-yl)-ethoxy]-phenyl}-acrylic acid ethyl ester as bright yellow oil.

Workup

  1. customquenched by the addition of sat. NaHCO3
  2. customThe layers were separated
  3. extractionthe aqueous phase was extracted two times with dichloromethane
  4. dry with materialThe combined organic layers were dried over sodium sulfate
  5. concentrationconcentrated in vacuo

Sources & evidence

ORD record
ord-64006945ead74965b76f7c9e65e0309b
Source dataset
uspto-grants-2003_11
Patent number
US06642389B2

Reaction notes

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