Pyrazine → 8-cyclohexyl-3-tosyl-3H-dipyrrolo[1,2-a:2',3'-e]pyrazine

HRID 2204549Notes

Reaction equation

HRID 2204549 reaction equation
[CH:1]1([C:7](=O)[CH2:8][CH2:9][C:10]2[N:11]=[C:12]3[CH:18]=[CH:17][N:16]([S:19]([C:22]4[CH:28]=[CH:27][C:25]([CH3:26])=[CH:24][CH:23]=4)(=[O:21])=[O:20])[C:13]3=[N:14][CH:15]=2)[CH2:6][CH2:5][CH2:4][CH2:3][CH2:2]1.O(C1C=CC(P2(=S)SP(=S)(C3C=CC(OC4C=CC=CC=4)=CC=3)S2)=CC=1)C1C=CC=CC=1.N1C=CN=CC=1>C1COCC1.CCOC(C)=O.C([O-])(O)=O.[Na+]>[CH:1]1([C:7]2[N:11]3[C:12]4[CH:18]=[CH:17][N:16]([S:19]([C:22]5[CH:28]=[CH:27][C:25]([CH3:26])=[CH:24][CH:23]=5)(=[O:21])=[O:20])[C:13]=4[N:14]=[CH:15][C:10]3=[CH:9][CH:8]=2)[CH2:6][CH2:5][CH2:4][CH2:3][CH2:2]1

Participants

7

Reactant 3

HCID 9261PyrazineHCID 118134142,4-Bis(4-phenoxyphenyl)-2,4-dithioxo-1,3,2,4-dithiadiphosphetaneHCID 580100201-cyclohexyl-3-(5-tosyl-5H-pyrrolo[2,3-b]pyrazin-2-yl)propan-1-one

Product 1

HCID 580099938-cyclohexyl-3-tosyl-3H-dipyrrolo[1,2-a:2',3'-e]pyrazine

Reagents, catalysts & solvents 3

HCID 8028TetrahydrofuranSolventHCID 8857Ethyl AcetateSolventHCID 516892Sodium BicarbonateSolvent

Procedure

To a solution of 1-cyclohexyl-3-(5-tosyl-5H-pyrrolo[2,3-b]pyrazin-2-yl)propan-1-one (0.050 g, 0.12 mmol) in THF (2 mL) was added 2,4-bis(4-phenoxyphenyl)-1,3-dithia-2,4-diphosphetane-2,4-disulfide (0.071 g, 0.13 mmol, TCI). After about 6 h at ambient temperature, the reaction mixture was diluted with EtOAc (50 mL) and NaHCO3 (50 mL). The organic layer was separated, dried over anhydrous Na2SO4, filtered, and concentrated under reduced pressure. The crude product was purified by chromatography on silica gel eluting with a gradient of 40-90% EtOAc in heptanes to provide 8-cyclohexyl-3-tosyl-3H-dipyrrolo[1,2-a:2;3′-e]pyrazine as a tan solid (0.020 g, 42%). LC/MS (Table 2, Method a) Rt=3.39 min; MS m/z: 394 (M+H)+.

Workup

  1. customThe organic layer was separated
  2. dry with materialdried over anhydrous Na2SO4
  3. filtrationfiltered
  4. concentrationconcentrated under reduced pressure
  5. customThe crude product was purified by chromatography on silica gel eluting with a gradient of 40-90% EtOAc in heptanes
  6. customto provide 8-cyclohexyl-3-tosyl-3H-dipyrrolo[1,2-a

Sources & evidence

ORD record
ord-eed698d8b39347a493c265177929cd4b
Source dataset
uspto-grants-2016_06
Patent number
US09365579B2

Reaction notes

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