Sodium Bicarbonate → 1,1-Dimethylethyl (2,3-dihydro[1,4]dioxino[2,3-c]pyridin-7-ylmethyl)(1-{2-[6-(methyloxy)-3-oxopyrido[2,3-b]pyrazin-4(3H)-yl]ethyl}-4-piperidinyl)carbamate

HRID 1510743Notes

Reaction equation

HRID 1510743 reaction equation
[O:1]1[C:10]2[CH:9]=[C:8]([CH2:11][N:12]([CH:20]3[CH2:25][CH2:24][NH:23][CH2:22][CH2:21]3)[C:13](=[O:19])[O:14][C:15]([CH3:18])([CH3:17])[CH3:16])[N:7]=[CH:6][C:5]=2[O:4][CH2:3][CH2:2]1.[CH3:26][O:27][C:28]1[CH:29]=[CH:30][C:31]2[N:36]=[CH:35][C:34](=[O:37])[N:33]([CH2:38][CH:39]=O)[C:32]=2[N:41]=1.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+].C(=O)([O-])O.[Na+]>ClCCl.C(Cl)(Cl)Cl.C(O)(=O)C>[O:1]1[C:10]2[CH:9]=[C:8]([CH2:11][N:12]([CH:20]3[CH2:25][CH2:24][N:23]([CH2:39][CH2:38][N:33]4[C:34](=[O:37])[CH:35]=[N:36][C:31]5[CH:30]=[CH:29][C:28]([O:27][CH3:26])=[N:41][C:32]4=5)[CH2:22][CH2:21]3)[C:13](=[O:19])[O:14][C:15]([CH3:18])([CH3:17])[CH3:16])[N:7]=[CH:6][C:5]=2[O:4][CH2:3][CH2:2]1

Participants

8

Reactant 4

HCID 516892Sodium BicarbonateHCID 5049666Sodium triacetoxyborohydrideHCID 57815220(6-methoxy-3-oxopyrido(2,3-b)pyrazin-4(3H)-yl)acetaldehydeHCID 578154611,1-Dimethylethyl (2,3-dihydro[1,4]dioxino[2,3-c]pyridin-7-ylmethyl)-4-piperidinylcarbamate

Product 1

HCID 578152431,1-Dimethylethyl (2,3-dihydro[1,4]dioxino[2,3-c]pyridin-7-ylmethyl)(1-{2-[6-(methyloxy)-3-oxopyrido[2,3-b]pyrazin-4(3H)-yl]ethyl}-4-piperidinyl)carbamateYield 59.5%

Reagents, catalysts & solvents 3

HCID 176Acetic AcidSolventHCID 6212ChloroformSolventHCID 6344DichloromethaneSolvent

Procedure

To a solution of 0.16 g of tert-butyl (2,3-dihydro(1,4)dioxino(2,3-c)pyridin-7-ylmethyl)(piperidin-4-yl)carbamate in 3 mL of dichloromethane, 0.10 g of (6-methoxy-3-oxopyrido(2,3-b)pyrazin-4(3H)-yl)acetaldehyde, 26 μL of acetic acid and 0.15 g of sodium triacetoxyborohydride were added, and the mixture was stirred at room temperature for 30 minutes. To the reaction mixture, chloroform and a saturated aqueous sodium hydrogen carbonate solution were added, the organic layer was separated, and the aqueous layer was extracted with chloroform. The organic layer and the extract were combined, the resultant solution was washed with a saturated aqueous sodium chloride solution and dried over anhydrous magnesium sulfate, and the solvent was distilled off under reduced pressure. The resultant residue was purified by flash basic silica gel column chromatography using an eluent of chloroform to obtain 0.15 g of tert-butyl (2,3-dihydro(1,4)dioxino(2,3-c)pyridin-7-ylmethyl)(1-(2-(6-methoxy-3-oxopyrido(2,3-b)pyrazin-4(3H)-yl)ethyl)piperidin-4-yl)carbamate as a light brown oily substance.

Workup

  1. customthe organic layer was separated
  2. extractionthe aqueous layer was extracted with chloroform
  3. washthe resultant solution was washed with a saturated aqueous sodium chloride solution
  4. dry with materialdried over anhydrous magnesium sulfate
  5. distillationthe solvent was distilled off under reduced pressure
  6. customThe resultant residue was purified by flash basic silica gel column chromatography

Sources & evidence

ORD record
ord-428753380f234fd398f912f7f552aaed
Source dataset
uspto-grants-2012_07
Patent number
US08211908B2

Reaction notes

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