Methane → tert-butyl 4-(5-(5-amino-6-(5-tert-butyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)-1-methyl-1H-1,2,4-triazol-3-yl)piperidine-1-carboxylate

HRID 1749678Notes

Reaction equation

HRID 1749678 reaction equation
N12CCCN=C1CCCC[CH2:2]2.[NH2:12][C:13]1[N:14]=[CH:15][C:16]([C:28]2[NH:32][N:31]=[C:30]([CH:33]3[CH2:38][CH2:37][N:36]([C:39]([O:41][C:42]([CH3:45])([CH3:44])[CH3:43])=[O:40])[CH2:35][CH2:34]3)[N:29]=2)=[N:17][C:18]=1[C:19]1[O:20][C:21]([C:24]([CH3:27])([CH3:26])[CH3:25])=[N:22][N:23]=1.C.IC>O>[NH2:12][C:13]1[N:14]=[CH:15][C:16]([C:28]2[N:32]([CH3:2])[N:31]=[C:30]([CH:33]3[CH2:38][CH2:37][N:36]([C:39]([O:41][C:42]([CH3:45])([CH3:44])[CH3:43])=[O:40])[CH2:35][CH2:34]3)[N:29]=2)=[N:17][C:18]=1[C:19]1[O:20][C:21]([C:24]([CH3:26])([CH3:27])[CH3:25])=[N:22][N:23]=1

Participants

6

Reactant 4

HCID 297MethaneHCID 6328Methyl iodide2×HCID 811841,8-Diazabicyclo(5.4.0)undec-7-ene2×HCID 178451827HCID 178451827, compound

Product 1

HCID 86727657tert-butyl 4-(5-(5-amino-6-(5-tert-butyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)-1-methyl-1H-1,2,4-triazol-3-yl)piperidine-1-carboxylateYield 50.1%

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Conditions

Temperature
-5 °C

Procedure

1,8-Diazabicyclo[5.4.0]undec-7-ene (19.87 mL, 132.90 mmol) was added to a suspension of tert-butyl 4-(5-(5-amino-6-(5-tert-butyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)-1H-1,2,4-triazol-3-yl)piperidine-1-carboxylate (48 g, 102.23 mmol) in 2-methylTHF (300 mL). A dark solution was obtained after 5 minutes which was treated with charcoal and filtered through a celite pad, washing the charcoal and charcoal with additional 2-methylTHF (100 mL). The filtrate was stirred with an air stirrer at −5° C. in a 3 L jacketed fixed vessel under an atmosphere of nitrogen. 2-methylTHF (100 mL) was added to help stir the yellow suspension. Iodomethane (7.96 mL, 127.78 mmol) was added dropwise over 15 minutes. The mixture was stirred for 2 hours and the reaction mixture was warmed to room temperature. After 16 hours, additional iodomethane (6 mL) and DBU (20 mL) was added and stirring was continued for 16 hours. The mixture was poured into water and stirred for 5 minutes. The insoluble material was isolated as a beige solid and dried in vacuo to afford tert-butyl 4-(5-(5-amino-6-(5-tert-butyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)-1-methyl-1H-1,2,4-triazol-3-yl)piperidine-1-carboxylate (24.77 g, 50.1%). The mother liquors were concentrated under reduced pressure and the residue was purified by flash column chromatography on silica using MTBE as the eluant. A second crop of the desired product (13.04 g, 26%), was thus obtained as a yellow solid: 1H NMR Spectrum: (DMSO-d6) 1.47 (9H, s), 1.51 (9H, s), 1.57-1.76 (2H, m), 1.94-2.1 (2H, m), 2.87-3.09 (3H, m), 3.9-4.08 (2H, m), 4.26 (3H, s), 7.97 (2H, br, s), 8.92 (1H, s); Mass Spectrum [M+H]+=484

Workup

  1. customA dark solution was obtained after 5 minutes which
  2. filtrationfiltered through a celite pad
  3. washwashing the charcoal and charcoal with additional 2-methylTHF (100 mL)
  4. addition2-methylTHF (100 mL) was added
  5. stirringto help stir the yellow suspension
  6. stirringThe mixture was stirred for 2 hours
  7. temperaturethe reaction mixture was warmed to room temperature
  8. stirringstirring
  9. waitwas continued for 16 hours
  10. stirringstirred for 5 minutes
  11. customThe insoluble material was isolated as a beige solid
  12. customdried in vacuo

Sources & evidence

ORD record
ord-12c55d438a60475399371158f1326ea8
Source dataset
uspto-grants-2015_10
Patent number
US09156831B2

Reaction notes

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