Phosphate → 3-[(2R)-2-[(3S,4R)-3-[(1R)-1-t-butyldimethylsilyloxyethyl]-2-oxoazetidin-4-yl]propionyl}-spiro[2,3-dihydro-4H-1,3-benzoxazine-2,1'-cyclohexan]-4-one

HRID 1781182Notes

Reaction equation

HRID 1781182 reaction equation
C(O[C@H:5]1[NH:8][C:7](=[O:9])[C@@H:6]1[C@H:10]([O:12][Si:13]([C:16]([CH3:19])([CH3:18])[CH3:17])([CH3:15])[CH3:14])[CH3:11])(=O)C.Br[CH:21]([CH3:40])[C:22]([N:24]1[C:29]2([CH2:34][CH2:33][CH2:32][CH2:31][CH2:30]2)[O:28][C:27]2[CH:35]=[CH:36][CH:37]=[CH:38][C:26]=2[C:25]1=[O:39])=[O:23].P([O-])([O-])([O-])=O>[Zn].O1CCCC1>[Si:13]([O:12][C@@H:10]([C@@H:6]1[C@@H:5]([C@@H:21]([CH3:40])[C:22]([N:24]2[C:29]3([CH2:34][CH2:33][CH2:32][CH2:31][CH2:30]3)[O:28][C:27]3[CH:35]=[CH:36][CH:37]=[CH:38][C:26]=3[C:25]2=[O:39])=[O:23])[NH:8][C:7]1=[O:9])[CH3:11])([C:16]([CH3:17])([CH3:18])[CH3:19])([CH3:14])[CH3:15]

Participants

6

Reactant 3

HCID 1061PhosphateHCID 103380523-(2-Bromopropanoyl)spiro[benzo[e][1,3]oxazine-2,1'-cyclohexan]-4(3H)-oneHCID 10935078Azetidon

Product 1

HCID 103458983-[(2R)-2-[(3S,4R)-3-[(1R)-1-t-butyldimethylsilyloxyethyl]-2-oxoazetidin-4-yl]propionyl}-spiro[2,3-dihydro-4H-1,3-benzoxazine-2,1'-cyclohexan]-4-oneYield 74.6%

Reagents, catalysts & solvents 2

HCID 23994ZincCatalystHCID 8028TetrahydrofuranSolvent

Procedure

1.0 g of (3R,4R)-4-acetoxy-3-[(1R)-1-t-butyldimethylsilyloxyethyl]-2-azetidinone, 1.8 g of 3-(2-bromopropionyl)-spiro[2,3-dihydro-4H-1,3-benzoxazine-2,1'-cyclohexan]-4-one and 0.68 g of zinc powders are added to 15 ml of tetrahydrofuran and the mixture is refluxed for 30 minutes. After cooling, the reaction mixture is poured into 0.2M phosphate buffer (pH 7.0) and the mixture is extracted with methylene chloride. The extract is washed, dried and evaporated to remove the solvent. The residue is purified by silica gel column chromatography (solvent; hexane:ethyl acetate=3:1) to obtain 1.3 g of 3-{(2R)-2-[(3S,4R)-3-[(1R)-1-t-butyldimethylsilyloxyethyl]-2-oxoazetidin-4-yl]propionyl}-spiro[2,3-dihydro-4H-1,3-benzoxazine-2,1'-cyclohexan]-4-one.

Workup

  1. temperaturethe mixture is refluxed for 30 minutes
  2. temperatureAfter cooling
  3. extractionthe mixture is extracted with methylene chloride
  4. washThe extract is washed
  5. customdried
  6. customevaporated
  7. customto remove the solvent
  8. customThe residue is purified by silica gel column chromatography (solvent; hexane:ethyl acetate=3:1)

Sources & evidence

ORD record
ord-6dfd1fb11b584d67aa30d6766dd60e4c
Source dataset
uspto-grants-1997_05
Patent number
US05631363

Reaction notes

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