Heptanoic acid, 7-oxo-, ethyl ester → rac-5-(7-Ethoxy-7-oxoheptyl)-2,3-diphenyl-5,6,7,8-tetrahydropyrido[2,3-b]pyrazine-7,8-diyl diacetate

HRID 406197Notes

Reaction equation

HRID 406197 reaction equation
[C:1]([O:4][CH:5]1[CH2:26][NH:25][C:8]2=[N:9][C:10]([C:19]3[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=3)=[C:11]([C:13]3[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=3)[N:12]=[C:7]2[CH:6]1[O:27][C:28](=[O:30])[CH3:29])(=[O:3])[CH3:2].O=[CH:32][CH2:33][CH2:34][CH2:35][CH2:36][CH2:37][C:38]([O:40][CH2:41][CH3:42])=[O:39].C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+]>ClCCCl.O>[C:1]([O:4][CH:5]1[CH2:26][N:25]([CH2:32][CH2:33][CH2:34][CH2:35][CH2:36][CH2:37][C:38]([O:40][CH2:41][CH3:42])=[O:39])[C:8]2=[N:9][C:10]([C:19]3[CH:20]=[CH:21][CH:22]=[CH:23][CH:24]=3)=[C:11]([C:13]3[CH:14]=[CH:15][CH:16]=[CH:17][CH:18]=3)[N:12]=[C:7]2[CH:6]1[O:27][C:28](=[O:30])[CH3:29])(=[O:3])[CH3:2]

Participants

6

Reactant 3

HCID 77609Heptanoic acid, 7-oxo-, ethyl ester2×HCID 5049666Sodium triacetoxyborohydride2×HCID 68070482Rac-2,3-diphenyl-5,6,7,8-tetrahydropyrido[2,3-b]pyrazine-7,8-diyl diacetate2×

Product 1

HCID 123258647rac-5-(7-Ethoxy-7-oxoheptyl)-2,3-diphenyl-5,6,7,8-tetrahydropyrido[2,3-b]pyrazine-7,8-diyl diacetate

Reagents, catalysts & solvents 2

HCID 111,2-DichloroethaneSolventHCID 962WaterSolvent

Procedure

To a solution of rac-2,3-diphenyl-5,6,7,8-tetrahydropyrido[2,3-b]pyrazine-7,8-diyl diacetate (Intermediate I) (69 mg, 0.171 mmol) in DCE (3 ml) was added ethyl 7-oxoheptanoate (88 mg, 0.513 mmol) followed by sodium triacetoxyborohydride (109 mg, 0.513 mmol). The reaction was left to stir overnight at room temperature under an atmosphere of nitrogen. To the reaction mixture was added further ethyl 7-oxoheptanoate (88 mg, 0.513 mmol) followed by sodium triacetoxyborohydride (109 mg, 0.513 mmol). The reaction mixture was left to stir at RT under an atmosphere of nitrogen for 4 days. The mixture was diluted with water and extracted with EtOAc (3×20 ml). The combined organic extracts were dried over MgSO4, filtered and concentrated in vacuo. The resulting crude product was purified by chromatography on silica eluting with 0-70% EtOAc/iso-hexane to afford the title compound;

Workup

  1. waitThe reaction was left
  2. waitThe reaction mixture was left
  3. stirringto stir at RT under an atmosphere of nitrogen for 4 days
  4. extractionextracted with EtOAc (3×20 ml)
  5. dry with materialThe combined organic extracts were dried over MgSO4
  6. filtrationfiltered
  7. concentrationconcentrated in vacuo
  8. customThe resulting crude product was purified by chromatography on silica eluting with 0-70% EtOAc/iso-hexane

Sources & evidence

ORD record
ord-53ea9981c86240eebff42d0d92968ab6
Source dataset
uspto-grants-2014_06
Patent number
US08754085B2

Reaction notes

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