Cesium carbonate → tert-butyl N-[(3S)-1-(6-bromo-4-methyl-3-oxo-pyrazin-2-yl)-3-piperidyl]carbamate

HRID 57955Notes

Reaction equation

Br[C:2]1[C:3](=[O:10])[N:4]([CH3:9])[CH:5]=[C:6]([Br:8])[N:7]=1.[NH:11]1[CH2:16][CH2:15][CH2:14][C@H:13]([NH:17][C:18](=[O:24])[O:19][C:20]([CH3:23])([CH3:22])[CH3:21])[CH2:12]1.C(=O)([O-])[O-].[Cs+].[Cs+].CC1(C)C2C(=C(P(C3C=CC=CC=3)C3C=CC=CC=3)C=CC=2)OC2C(P(C3C=CC=CC=3)C3C=CC=CC=3)=CC=CC1=2>O1CCOCC1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.[Pd].[Pd]>[Br:8][C:6]1[N:7]=[C:2]([N:11]2[CH2:16][CH2:15][CH2:14][C@H:13]([NH:17][C:18](=[O:24])[O:19][C:20]([CH3:22])([CH3:21])[CH3:23])[CH2:12]2)[C:3](=[O:10])[N:4]([CH3:9])[CH:5]=1

Participants

Conditions

Temperature: 110 °C

Procedure

A mixture of 3,5-dibromo-1-methyl-pyrazin-2-one (2.025 mmol; 542.4 mg), tert-butyl N-[(3S)-3-piperidyl]carbamate (2.025 mmol; 405.5 mg), cesium carbonate (4.049 mmol; 1319 mg), Xantphos (0.1721 mmol; 102.7 mg), and tris(dibenzylideneacetone)dipalladium(0) (0.1012 mmol; 93.63 mg) in 1,4-dioxane (10 mL) was purged with Argon, then sealed and stirred at 110° C. overnight. The mixture was cooled to room temperature and filtered through Celite. The filtrate was concentrated and the residue was purified on silica eluted with 0 to 20% EtOAc in DCM to afford tert-butyl N-[(3S)-1-(6-bromo-4-methyl-3-oxo-pyrazin-2-yl)-3-piperidyl]carbamate as a yellow solid (451.0 mg, 58%).

Workup

customwas purged with Argon
customsealed
temperatureThe mixture was cooled to room temperature
filtrationfiltered through Celite
concentrationThe filtrate was concentrated
customthe residue was purified on silica
washeluted with 0 to 20% EtOAc in DCM

Sources & evidence

ORD record: ord-0a71d5f08abc4687828e33cf2da6af07
Source dataset: uspto-grants-2016_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09434725B2

Reaction notes

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