Dimethylformamide → (R)-8-(benzyloxy)-5-(2-bromo-1-((tert-butyldimethylsilyl)oxy)ethyl)quinolin-2(1H)-one

HRID 899996Notes

Reaction equation

HRID 899996 reaction equation
[CH2:1]([O:8][C:9]1[CH:10]=[CH:11][C:12]([C@@H:20]([OH:23])[CH2:21][Br:22])=[C:13]2[C:18]=1[NH:17][C:16](=[O:19])[CH:15]=[CH:14]2)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.CN(C)C=O.N1C(C)=CC=CC=1C.FC(F)(F)S(O[Si:43]([C:46]([CH3:49])([CH3:48])[CH3:47])([CH3:45])[CH3:44])(=O)=O>C1CCCCC1.CO>[CH2:1]([O:8][C:9]1[CH:10]=[CH:11][C:12]([C@@H:20]([O:23][Si:43]([C:46]([CH3:49])([CH3:48])[CH3:47])([CH3:45])[CH3:44])[CH2:21][Br:22])=[C:13]2[C:18]=1[NH:17][C:16](=[O:19])[CH:15]=[CH:14]2)[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1

Participants

7

Reactant 4

HCID 6228DimethylformamideHCID 79372,6-LutidineHCID 123564tert-Butyldimethylsilyl trifluoromethanesulphonateHCID 115308845-((1R)-2-bromo-1-hydroxyethyl)-8-phenylmethoxy-1H-quinolin-2-one

Product 1

HCID 15606253(R)-8-(benzyloxy)-5-(2-bromo-1-((tert-butyldimethylsilyl)oxy)ethyl)quinolin-2(1H)-oneYield 80%

Reagents, catalysts & solvents 2

HCID 887MethanolSolventHCID 8078CyclohexaneSolvent

Procedure

To the product of step (b) (70.2 g, 189 mmol) was added N,N-dimethylformamide (260 mL) and this mixture was cooled in an ice bath under nitrogen. 2,6-Lutidine (40.3 g, 376 mmol) was added over 5 min and then tert-butyldimethylsilyl trifluoromethanesulfonate (99.8 g, 378 mmol) was added slowly while maintaining the temperature below 20° C. The mixture was allowed to warn to room temperature for 45 min. Methanol (45 mL) was added to the mixture dropwise over 10 min and the mixture was partitioned between ethyl acetate/cyclohexane (1:1, 500 mL) and water/brine (1:1, 500 mL). The organics were washed twice more with water/brine (1:1, 500 mL each). The combined organics were evaporated under reduced pressure to give a light yellow oil. Two separate portions of cyclohexane (400 mL) were added to the oil and distillation continued until a thick white slurry was formed. Cyclohexane (300 mL) was added to the slurry and the resulting white crystals were filtered, washed with cyclohexane (300 mL) and dried under reduced pressure to give the title compound (75.4 g, 151 mmol, 80% yield, 98.6% ee).

Workup

  1. temperaturethis mixture was cooled in an ice bath under nitrogen
  2. temperaturewhile maintaining the temperature below 20° C
  3. customthe mixture was partitioned between ethyl acetate/cyclohexane (1:1, 500 mL) and water/brine (1:1, 500 mL)
  4. washThe organics were washed twice more with water/brine (1:1, 500 mL each)
  5. customThe combined organics were evaporated under reduced pressure
  6. customto give a light yellow oil
  7. customTwo separate portions of cyclohexane (400 mL)
  8. additionwere added to the oil and distillation
  9. customwas formed
  10. filtrationthe resulting white crystals were filtered
  11. washwashed with cyclohexane (300 mL)
  12. customdried under reduced pressure

Sources & evidence

ORD record
ord-2510952368184fb29b97727e5abbd191
Source dataset
uspto-grants-2008_04
Patent number
US07355046B2

Reaction notes

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