Acetic Acid → HCID 69543912, compound

HRID 891655Notes

Reaction equation

HRID 891655 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]([NH2:57])[CH2:53][CH:54]([CH3:56])[CH3:55])([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[CH2:22][N:21]([C:23]2[S:24][CH:25]=[C:26]([C:28](=[O:29])[NH:57][C@H:52]([CH2:51][O:50][Si:33]([C:46]([CH3:48])([CH3:47])[CH3:49])([C:34]3[CH:39]=[CH:38][CH:37]=[CH:36][CH:35]=3)[C:40]3[CH:45]=[CH:44][CH:43]=[CH:42][CH:41]=3)[CH2:53][CH:54]([CH3:56])[CH3:55])[N:27]=2)[CH2:20]1)([C:14]([CH3:17])([CH3:15])[CH3:16])([C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1)[C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1

Participants

6

Reactant 4

HCID 176Acetic AcidHCID 8857Ethyl Acetate2×HCID 222429823-t-Butyldiphenylsilyloxy-1-(4-ethoxycarbonyl-1,3-thiazol-2-yl)azetidineHCID 23598345HCID 23598345, compound

Product 1

HCID 69543912HCID 69543912, compoundYield 64%

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)-3-methylbutylamine-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 in the ice bath for 0.5 hours. After adding ethyl acetate thereto, the reaction mixture was partitioned between ethyl acetate and water. 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→4:1) as the eluant to afford 3-t-butyldiphenylsilyloxy-1-{4-[(1S)-1-(t-butyldiphenylsilyloxymethyl)-3-methylbutylcarbamoyl]-1,3-thiazol-2-yl}azetidine (2.14 g, yield 64%) 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. customthe reaction mixture was partitioned between ethyl acetate and water
  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-7f760cd155284d5cb7e152cf5b4d4fd3
Source dataset
uspto-grants-2006_02
Patent number
US07001897B2

Reaction notes

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