(S)-3-((S)-1-(4-bromophenyl)ethyl)-6-(2-oxopropyl)-6-phenyl-1,3-oxazinan-2-one → (S)-3-((S)-1-(4-bromophenyl)ethyl)-6-(2-hydroxy-2-methylpropyl)-6-phenyl-1,3-oxazinan-2-one

HRID 1096378Notes

Reaction equation

HRID 1096378 reaction equation
[Br:1][C:2]1[CH:7]=[CH:6][C:5]([C@@H:8]([N:10]2[CH2:15][CH2:14][C@:13]([CH2:22][C:23](=[O:25])[CH3:24])([C:16]3[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=3)[O:12][C:11]2=[O:26])[CH3:9])=[CH:4][CH:3]=1.[CH3:27][Mg]Br>C1COCC1>[Br:1][C:2]1[CH:7]=[CH:6][C:5]([C@@H:8]([N:10]2[CH2:15][CH2:14][C@:13]([CH2:22][C:23]([OH:25])([CH3:27])[CH3:24])([C:16]3[CH:17]=[CH:18][CH:19]=[CH:20][CH:21]=3)[O:12][C:11]2=[O:26])[CH3:9])=[CH:4][CH:3]=1

Participants

4

Reactant 2

HCID 59532378(S)-3-((S)-1-(4-bromophenyl)ethyl)-6-(2-oxopropyl)-6-phenyl-1,3-oxazinan-2-oneHCID 178418573HCID 178418573, compound

Product 1

HCID 44599033(S)-3-((S)-1-(4-bromophenyl)ethyl)-6-(2-hydroxy-2-methylpropyl)-6-phenyl-1,3-oxazinan-2-oneYield 53%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

To a solution of (S)-3-((S)-1-(4-bromophenyl)ethyl)-6-(2-oxopropyl)-6-phenyl-1,3-oxazinan-2-one (12 g, 28.8 mmol) in anhydrous THF (100 mL) was added dropwise methylmagnesium bromide (48 mL, 144 mmol) at −78° C. under nitrogen. The mixture was stirred at rt for 1 h. The reaction mixture was quenched with aqueous NH4Cl solution (50 mL) in ice water bath. The layers were separated and the aqueous layer was extracted with EtOAc (150 mL). The combined organic phases were washed with brine (30 mL), dried over Na2SO4 and concentrated in vacuo to give the crude product, which was purified by preparative HPLC and chiral HPLC to afford (S)-3-((S)-1-(4-bromophenyl)ethyl)-6-(2-hydroxy-2-methylpropyl)-6-phenyl-1,3-oxazinan-2-one (6.6 g, 53%).

Workup

  1. customThe reaction mixture was quenched with aqueous NH4Cl solution (50 mL) in ice water bath
  2. customThe layers were separated
  3. extractionthe aqueous layer was extracted with EtOAc (150 mL)
  4. washThe combined organic phases were washed with brine (30 mL)
  5. dry with materialdried over Na2SO4
  6. concentrationconcentrated in vacuo
  7. customto give the crude product, which
  8. customwas purified by preparative HPLC and chiral HPLC

Sources & evidence

ORD record
ord-86d396d5ceab4c209bb1e3a5fa7bcdaf
Source dataset
uspto-grants-2012_03
Patent number
US08138178B2

Reaction notes

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