Sodium triacetoxyborohydride → 6-[({1-[2-(5,7-Difluoro-2-oxoquinoxalin-1(2H)-yl)ethyl]piperidin-4-yl}amino)methyl]-2H-pyrido[3,2-b][1,4]oxazin-3(4H)-one

HRID 1644486Notes

Reaction equation

HRID 1644486 reaction equation
[NH2:1][CH:2]1[CH2:7][CH2:6][N:5]([CH2:8][CH2:9][N:10]2[C:19]3[C:14](=[C:15]([F:21])[CH:16]=[C:17]([F:20])[CH:18]=3)[N:13]=[CH:12][C:11]2=[O:22])[CH2:4][CH2:3]1.[O:23]=[C:24]1[CH2:29][O:28][C:27]2[CH:30]=[CH:31][C:32]([CH:34]=O)=[N:33][C:26]=2[NH:25]1.[BH-](OC(C)=O)(OC(C)=O)OC(C)=O.[Na+]>CO.C(OCC)(=O)C>[F:21][C:15]1[CH:16]=[C:17]([F:20])[CH:18]=[C:19]2[C:14]=1[N:13]=[CH:12][C:11](=[O:22])[N:10]2[CH2:9][CH2:8][N:5]1[CH2:4][CH2:3][CH:2]([NH:1][CH2:34][C:32]2[CH:31]=[CH:30][C:27]3[O:28][CH2:29][C:24](=[O:23])[NH:25][C:26]=3[N:33]=2)[CH2:7][CH2:6]1

Participants

6

Reactant 3

HCID 5049666Sodium triacetoxyborohydrideHCID 218737373-Oxo-3,4-dihydro-2H-pyrido[3,2-b][1,4]oxazine-6-carbaldehydeHCID 667741441-[2-(4-aminopiperidin-1-yl)ethyl]-5,7-difluoroquinoxalin-2(1H)-one2×

Product 1

HCID 667743546-[({1-[2-(5,7-Difluoro-2-oxoquinoxalin-1(2H)-yl)ethyl]piperidin-4-yl}amino)methyl]-2H-pyrido[3,2-b][1,4]oxazin-3(4H)-oneYield 43.1%

Reagents, catalysts & solvents 2

HCID 887MethanolSolventHCID 8857Ethyl AcetateSolvent

Conditions

Temperature
0 °C

Procedure

To a solution of 1-[2-(4-aminopiperidin-1-yl)ethyl]-5,7-difluoroquinoxalin-2(1H)-one (Intermediate 192, 0.158 g) in methanol (10 mL) were added 3 Å molecular sieve power (0.15 g) and 3-oxo-3,4-dihydro-2H-pyrido[3,2-b][1,4]oxazine-6-carbaldehyde (WO 2004/058144) (92 mg). After 2 hours at reflux, the reaction was cooled to 0° C. and NaBH(OAc)3 (0.19 g) was added. The reaction was allowed to warm to room temperature and was stirred overnight. It was diluted with ethyl acetate, filtered, washed with saturated solutions of Na2CO3 and brine, dried over sodium sulfate and concentrated. Chromatography on silica gel with 0-20% methanol in dichloromethane. Fractions containing product were collected, concentrated, dissolved in a minimum of CH2Cl2, precipitated with diethyl ether, and filtered to yield 104 mg of product.

Workup

  1. temperatureAfter 2 hours at reflux
  2. temperatureto warm to room temperature
  3. filtrationfiltered
  4. washwashed with saturated solutions of Na2CO3 and brine
  5. dry with materialdried over sodium sulfate
  6. concentrationconcentrated
  7. additionFractions containing product
  8. customwere collected
  9. concentrationconcentrated
  10. dissolutiondissolved in a minimum of CH2Cl2
  11. customprecipitated with diethyl ether
  12. filtrationfiltered

Sources & evidence

ORD record
ord-19e97ddfdb81406d82b62d661350dcc9
Source dataset
uspto-grants-2012_02
Patent number
US08124602B2

Reaction notes

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