Ethyl Acetate → tert-butyl 4-methyl-3-(6-tosyl-6H-imidazo[1,5-a]pyrrolo[2,3-e]pyrazin-1-yl)piperidine-1-carboxylate

HRID 1854412Notes

Reaction equation

HRID 1854412 reaction equation
[CH3:1][CH:2]1[CH2:7][CH2:6][N:5]([C:8]([O:10][C:11]([CH3:14])([CH3:13])[CH3:12])=[O:9])[CH2:4][CH:3]1[C:15](=O)[NH:16][CH2:17][C:18]1[N:19]=[C:20]2[CH:26]=[CH:25][N:24]([S:27]([C:30]3[CH:36]=[CH:35][C:33]([CH3:34])=[CH:32][CH:31]=3)(=[O:29])=[O:28])[C:21]2=[N:22][CH:23]=1.COC1C=CC(P2(SP(C3C=CC(OC)=CC=3)(=S)S2)=S)=CC=1.CCOC(C)=O>O1CCOCC1.C(O[Hg]OC(=O)C)(=O)C>[CH3:1][CH:2]1[CH2:7][CH2:6][N:5]([C:8]([O:10][C:11]([CH3:14])([CH3:12])[CH3:13])=[O:9])[CH2:4][CH:3]1[C:15]1[N:19]2[C:20]3[CH:26]=[CH:25][N:24]([S:27]([C:30]4[CH:31]=[CH:32][C:33]([CH3:34])=[CH:35][CH:36]=4)(=[O:28])=[O:29])[C:21]=3[N:22]=[CH:23][C:18]2=[CH:17][N:16]=1

Participants

6

Reactant 3

HCID 8857Ethyl AcetateHCID 87949Lawesson's reagentHCID 58009799tert-butyl 4-methyl-3-((5-tosyl-5H-pyrrolo[2,3-b]pyrazin-2-yl)methylcarbamoyl)piperidine-1-carboxylate

Product 1

HCID 58009941tert-butyl 4-methyl-3-(6-tosyl-6H-imidazo[1,5-a]pyrrolo[2,3-e]pyrazin-1-yl)piperidine-1-carboxylateYield 44.9%

Reagents, catalysts & solvents 2

HCID 16683746DiacetyloxymercuryCatalyst2×HCID 312751,4-DioxaneSolvent

Conditions

Temperature
80 °C

Procedure

To a solution of tert-butyl 4-methyl-3-((5-tosyl-5H-pyrrolo[2,3-b]pyrazin-2-yl)methylcarbamoyl)piperidine-1-carboxylate (44 g, 83 mmol) in 1,4-dioxane (500 mL) was added Lawesson's reagent (20.2 g, 50.0 mmol). The reaction was heated at about 80° C. for about 1 h. The reaction was allowed to cool to ambient temperature followed by the addition of diacetoxymercury (26.6 g, 83.0 mmol). After about 1 h, additional diacetoxymercury (13.3 g, 42.0 mmol) was added. After about 15 min, the reaction was poured into stirred EtOAc (2 L). After about 15 min, the reaction was filtered through Celite® and the filtrate was concentrated under reduced pressure. The resulting residue was triturated with EtOAc (500 mL) and filtered. The filtrate was concentrated under reduced pressure and purified by silica gel chromatography (330 g column) eluting with a gradient of 10-50% EtOAc in heptane to provide tert-butyl 4-methyl-3-(6-tosyl-6H-imidazo[1,5-a]pyrrolo[2,3-e]pyrazin-1-yl)piperidine-1-carboxylate (19 g, 44%) as a white solid: LC/MS (Table 2, Method a) Rt=2.57 min; MS m/z: 510 (M+H)+.

Workup

  1. temperatureto cool to ambient temperature
  2. waitAfter about 15 min
  3. additionthe reaction was poured
  4. waitAfter about 15 min
  5. filtrationthe reaction was filtered through Celite®
  6. concentrationthe filtrate was concentrated under reduced pressure
  7. customThe resulting residue was triturated with EtOAc (500 mL)
  8. filtrationfiltered
  9. concentrationThe filtrate was concentrated under reduced pressure
  10. custompurified by silica gel chromatography (330 g column)
  11. washeluting with a gradient of 10-50% EtOAc in heptane

Sources & evidence

ORD record
ord-96725445e6ed40948461e19814e6443f
Source dataset
uspto-grants-2015_02
Patent number
US08962629B2

Reaction notes

Loading…