Sodium Carbonate → Tert-butyl cyclopropyl(5-(2-fluoropyridin-4-yl)-3-formylpyrazolo[1,5-a]pyrimidin-7-yl)carbamate

HRID 624715Notes

Reaction equation

Cl[C:2]1[CH:7]=[C:6]([N:8]([CH:16]2[CH2:18][CH2:17]2)[C:9](=[O:15])[O:10][C:11]([CH3:14])([CH3:13])[CH3:12])[N:5]2[N:19]=[CH:20][C:21]([CH:22]=[O:23])=[C:4]2[N:3]=1.[F:24][C:25]1[CH:30]=[C:29](B(O)O)[CH:28]=[CH:27][N:26]=1.C([O-])([O-])=O.[Na+].[Na+]>C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1.COCCOC.CCO>[CH:16]1([N:8]([C:6]2[N:5]3[N:19]=[CH:20][C:21]([CH:22]=[O:23])=[C:4]3[N:3]=[C:2]([C:29]3[CH:28]=[CH:27][N:26]=[C:25]([F:24])[CH:30]=3)[CH:7]=2)[C:9](=[O:15])[O:10][C:11]([CH3:14])([CH3:13])[CH3:12])[CH2:18][CH2:17]1

Participants

Conditions

Temperature: 85 °C

Procedure

To tert-butyl 5-chloro-3-formylpyrazolo[1,5-a]pyrimidin-7-yl(cyclopropyl)carbamate (1 g, 3 mmol) in 29 mL of a 2:1 mixture of 1,2-dimethoxyethane/EtOH was added 2-Fluoropyridine-4-boronic acid (500 mg, 3.55 mmol), tetrakis(triphenylphosphine)palladium(0) (173 mg, 0.15 mmol), and 2M aqueous solution of Na2CO3 (4.4 mL, 8.9 mmol). The mixture was stirred at 85° C. for 8 hours. The volatiles were removed by rotary evaporation and the residue was purified by silica gel chromatography (35% EtOAc/Hexanes) to provide 324 mg tert-butyl cyclopropyl(5-(2-fluoropyridin-4-yl)-3-formylpyrazolo[1,5-a]pyrimidin-7-yl)carbamate (28% yield). LCMS (M+1=398)

Workup

customThe volatiles were removed by rotary evaporation
customthe residue was purified by silica gel chromatography (35% EtOAc/Hexanes)

Sources & evidence

ORD record: ord-834358cfd6c34dabba1d194447ad1f67
Source dataset: uspto-grants-2016_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09303033B2

Reaction notes

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