Acetic Acid → HCID 69543899, compound

HRID 891633Notes

Reaction equation

HRID 891633 reaction equation
[Si:1]([O:18][CH:19]1[CH2:22][N:21]([C:23]2[S:24][CH:25]=[C:26]([C:28](OCC)=[O:29])[N:27]=2)[CH2:20]1)([C:14]([CH3:17])([CH3:16])[CH3:15])([C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[Si:33]([O:50][CH2:51][C@@H:52]([NH2:55])[CH2:53][CH3:54])([C:46]([CH3:49])([CH3:48])[CH3:47])([C:40]1[CH:45]=[CH:44][CH:43]=[CH:42][CH:41]=1)[C:34]1[CH:39]=[CH:38][CH:37]=[CH:36][CH:35]=1.C[Al](C)C.C(O)(=O)C.C(OCC)(=O)C>C1C=CC=CC=1>[Si:1]([O:18][CH:19]1[CH2:20][N:21]([C:23]2[S:24][CH:25]=[C:26]([C:28](=[O:29])[NH:55][C@H:52]([CH2:51][O:50][Si:33]([C:46]([CH3:47])([CH3:49])[CH3:48])([C:40]3[CH:41]=[CH:42][CH:43]=[CH:44][CH:45]=3)[C:34]3[CH:35]=[CH:36][CH:37]=[CH:38][CH:39]=3)[CH2:53][CH3:54])[N:27]=2)[CH2:22]1)([C:14]([CH3:16])([CH3:17])[CH3:15])([C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1)[C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1

Participants

6

Reactant 4

HCID 176Acetic AcidHCID 8857Ethyl AcetateHCID 222429823-t-Butyldiphenylsilyloxy-1-(4-ethoxycarbonyl-1,3-thiazol-2-yl)azetidineHCID 23598347HCID 23598347, compound

Product 1

HCID 69543899HCID 69543899, compoundYield 79%

Reagents, catalysts & solvents 1

HCID 241BenzeneSolvent2×

Procedure

Subsequently, to a solution of 3-t-butyldiphenylsilyloxy-1-(4-ethoxycarbonyl-1,3-thiazol-2-yl)azetidine (2.00 g, 4.29 mmol) (obtained as described in Reference Example 2(1)) in benzene (100 ml) was added a solution of 0.67M (1S)-1-(t-butyldiphenylsilyloxymethyl)propylamine-trimethylaluminium in benzene (12.9 ml) at room temperature under an atmosphere of nitrogen. The mixture was heated under reflux overnight. After checking the completion of the reaction, 10% aqueous acetic acid solution (100 ml) and ethyl acetate (200 ml) were added to the reaction mixture in an ice bath and the resulting mixture was stirred at room temperature for 1 hour. The reaction mixture was extracted with ethyl acetate. The organic layer was washed successively with saturated aqueous sodium hydrogencarbonate solution and saturated aqueous sodium chloride solution, dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The residue was purified by chromatography on a silica gel column using n-hexane:ethyl acetate (6:1→2:1) as the eluant to afford 3-t-butyldiphenylsilyloxy-1-{4-[(1S)-1-(t-butyldiphenylsilyloxymethyl)-propylcarbamoyl]-1,3-thiazol-2-yl}azetidine (2.52 g, yield 79%) as a pale brown solid.

Workup

  1. customat room temperature
  2. temperatureThe mixture was heated
  3. temperatureunder reflux overnight
  4. additionwere added to the reaction mixture in an ice bath
  5. extractionThe reaction mixture was extracted with ethyl acetate
  6. washThe organic layer was washed successively with saturated aqueous sodium hydrogencarbonate solution and saturated aqueous sodium chloride solution
  7. dry with materialdried over anhydrous sodium sulfate
  8. filtrationfiltered
  9. concentrationconcentrated under reduced pressure
  10. customThe residue was purified by chromatography on a silica gel column

Sources & evidence

ORD record
ord-e65b023b6a58409f9630736460978745
Source dataset
uspto-grants-2006_02
Patent number
US07001897B2

Reaction notes

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