Sodium Bicarbonate → 1-(2-(4-((7-chloro-3-oxo-3,4-dihydro-2H-pyrido[3,2-b][1,4]thiazin-6-yl)methylamino)piperidin-1-yl)ethyl)-7-methoxyquinoxalin-2(1H)-one

HRID 2193352Notes

Reaction equation

HRID 2193352 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](=[CH:15][CH:16]=[C:17]([O:20][CH3:21])[CH:18]=3)[N:13]=[CH:12][C:11]2=[O:22])[CH2:4][CH2:3]1.[Cl:23][C:24]1[C:33]([CH:34]=O)=[N:32][C:31]2[NH:30][C:29](=[O:36])[CH2:28][S:27][C:26]=2[CH:25]=1.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+].C(=O)([O-])O.[Na+]>C(O)(=O)C.C(Cl)(Cl)Cl>[Cl:23][C:24]1[C:33]([CH2:34][NH:1][CH:2]2[CH2:3][CH2:4][N:5]([CH2:8][CH2:9][N:10]3[C:19]4[C:14](=[CH:15][CH:16]=[C:17]([O:20][CH3:21])[CH:18]=4)[N:13]=[CH:12][C:11]3=[O:22])[CH2:6][CH2:7]2)=[N:32][C:31]2[NH:30][C:29](=[O:36])[CH2:28][S:27][C:26]=2[CH:25]=1

Participants

7

Reactant 4

HCID 516892Sodium BicarbonateHCID 5049666Sodium triacetoxyborohydrideHCID 218735897-Chloro-3-oxo-3,4-dihydro-2H-pyrido[3,2-b][1,4]thiazine-6-carbaldehydeHCID 593978381-[2-(4-Aminopiperidin-1-yl)ethyl]-7-methoxyquinoxalin-2(1H)-one

Product 1

HCID 593983901-(2-(4-((7-chloro-3-oxo-3,4-dihydro-2H-pyrido[3,2-b][1,4]thiazin-6-yl)methylamino)piperidin-1-yl)ethyl)-7-methoxyquinoxalin-2(1H)-oneYield 78.3%

Reagents, catalysts & solvents 2

HCID 176Acetic AcidSolventHCID 6212ChloroformSolvent

Procedure

To 12 mL of a chloroform solution containing 609 mg of 1-(2-(4-aminopiperidin-1-yl)ethyl)-7-methoxyquinoxalin-2(1H)-one and 414 mg of 7-chloro-3-oxo-3,4-dihydro-2H-pyrido[3,2-b][1,4]thiazine -6-carbaldehyde, 121 mg of acetic acid was added, and stirred at room temperature for 3 hours. To the reaction mixture, 618 mg of sodium triacetoxyborohydride was added, and stirred for 10.5 hours. Aqueous saturated sodium hydrogen carbonate solution was added, and the organic layer was separated. The organic layer was washed with aqueous saturated sodium chloride solution, dried over anhydrous magnesium sulfate, and the solvent was removed under reduced pressure. The residue thus obtained was purified by silica gel column chromatography [Silica Gel; Kanto Chemical Co., Inc., Silica Gel 60N, eluent; chloroform:methanol=10:1], to give 0.73 g of 1-(2-(4-((7-chloro-3-oxo-3,4-dihydro-2H-pyrido[3,2-b][1,4]thiazin-6-yl)methylamino)piperidin-1-yl)ethyl)-7-methoxyquinoxalin-2(1H)-one as a pale yellow foam. To 3 mL of an ethyl acetate solution containing 0.30 g of 1-(2-(4-((7-chloro-3-oxo-3,4-dihydro-2H-pyrido[3,2-b][1,4]thiazin-6-yl)methylamino)piperidin-1-yl)ethyl)-7-methoxyquinoxalin-2(1H)-one, 2 mL of 4 mol/L hydrogen chloride/ethyl acetate was added, and stirred at room temperature. The resulting solid was filtered to give 300 mg of l-(2-(4-((7-chloro-3-oxo-3,4-dihydro-2H-pyrido[3,2-b][1,4]thiazin-6-yl)methylamino)piperidin-1-yl)ethyl)-7-methoxyquinoxalin-2(1H)-one hydrochloride as a pale yellow solid.

Workup

  1. additionwas added
  2. stirringstirred for 10.5 hours
  3. customthe organic layer was separated
  4. washThe organic layer was washed with aqueous saturated sodium chloride solution
  5. dry with materialdried over anhydrous magnesium sulfate
  6. customthe solvent was removed under reduced pressure
  7. customThe residue thus obtained
  8. customwas purified by silica gel column chromatography [Silica Gel; Kanto Chemical Co., Inc., Silica Gel 60N, eluent; chloroform:methanol=10:1]

Sources & evidence

ORD record
ord-02759486ecab46d580bcbbfc29573e66
Source dataset
uspto-grants-2012_12
Patent number
US08329694B2

Reaction notes

Loading…