Cesium carbonate → HCID 59560421, compound

HRID 1177375Notes

Reaction equation

Cl[C:2]1[N:3]=[CH:4][C:5]([C:8]([O:10][CH3:11])=[O:9])=[N:6][CH:7]=1.[CH3:12][N:13]1[CH:17]=[CH:16][C:15]([NH:18][C:19]([C:21]2[CH:31]=[C:30]([OH:32])[C:24]3[CH2:25][C:26]([CH3:29])([CH3:28])[O:27][C:23]=3[CH:22]=2)=[O:20])=[N:14]1.C([O-])([O-])=O.[Cs+].[Cs+]>CN(C=O)C>[CH3:11][O:10][C:8]([C:5]1[CH:4]=[N:3][C:2]([O:32][C:30]2[C:24]3[CH2:25][C:26]([CH3:28])([CH3:29])[O:27][C:23]=3[CH:22]=[C:21]([C:19](=[O:20])[NH:18][C:15]3[CH:16]=[CH:17][N:13]([CH3:12])[N:14]=3)[CH:31]=2)=[CH:7][N:6]=1)=[O:9]

Participants

Conditions

Temperature: 160 °C

Procedure

A mixture of methyl 5-chloropyrazine-2-carboxylate (60.1 mg, 0.348 mmol), 4-hydroxy-2,2-dimethyl-2,3-dihydro-benzofuran-6-carboxylic acid (1-methyl-1H-pyrazol-3-yl)-amide (31a) (100 mg, 0.348 mmol) and Cs2CO3 (227 mg, 0.696 mmol) in DMF was heated to 160° C. in a microwave for 30 min, cooled to room temperature, quenched with H2O and extracted with 3×EtOAc. The combined organic layer was washed with 2×H2O, dried over Na2SO4 and concentrated. The residue was purified by column chromatography eluting with 45% to 70% EtOAc in hexanes to give a colorless thick oil (71 mg, 48% yield). 1H NMR (400 MHz, CDCl3) δ 8.94 (s, 1 H) 8.85 (d, J=1.01 Hz, 1 H) 8.52 (d, J=1.26 Hz, 1 H) 7.27 (d, J=2.27 Hz, 1 H) 7.21 (s, 1 H) 7.15 (s, 1 H) 6.80 (d, J=2.02 Hz, 1 H) 4.03 (s, 3 H) 3.74 (s, 3 H) 2.86 (s, 2 H) 1.49 (s, 6 H); LCMS for C21H21N5O5 m/z 424.20 (M+H+).

Workup

temperaturecooled to room temperature
customquenched with H2O
extractionextracted with 3×EtOAc
washThe combined organic layer was washed with 2×H2O
dry with materialdried over Na2SO4
concentrationconcentrated
customThe residue was purified by column chromatography
washeluting with 45% to 70% EtOAc in hexanes

Sources & evidence

ORD record: ord-b523fde8414d408babfb75a5a64e5ff6
Source dataset: uspto-grants-2010_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07842713B2

Reaction notes

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