Dimethyl Sulfoxide → HCID 178454109, compound

HRID 707330Notes

Reaction equation

[C:1]([O:5][C:6](=[O:14])[NH:7][C@H:8]1[CH2:11][C@H:10]([NH:12][NH2:13])[CH2:9]1)([CH3:4])([CH3:3])[CH3:2].Cl[C:16]1[C:21]([C:22]#[N:23])=[CH:20][CH:19]=[CH:18][N:17]=1.C([O-])(=O)C.[Cs+].CS(C)=O>C(OCC)(=O)C.[Cu]>[C:1]([O:5][C:6](=[O:14])[NH:7][C@H:8]1[CH2:9][C@H:10]([N:12]2[C:16]3=[N:17][CH:18]=[CH:19][CH:20]=[C:21]3[C:22]([NH2:23])=[N:13]2)[CH2:11]1)([CH3:4])([CH3:2])[CH3:3]

Participants

Conditions

Temperature: 100 °C

Procedure

Tert-butyl(trans-3-hydrazinylcyclobutyl)carbamate (4 g, 19.87 mmol), 2-chloro-3-cyanopyridine (3 g, 21.65 mmol), cesium acetate (14 g, 72.9 mmol), and copper powder (0.126 g, 1.987 mmol) were placed under nitrogen. Dry dimethylsulfoxide (20 mL) was added and the mixture stirred at 100° C. After 1 hour the mixture was cooled and diluted with ethyl acetate (300 mL). The mixture was filtered through a pad of celite and the filtrate washed with 10% saturated sodium bicarbonate (500 mL) before drying with magnesium sulfate and evaporating to dryness under reduced pressure. Purification using silica chromatography (10% (2 N ammonia in methanol) in dichloromethane) gave the desired tert-butyl(trans-3-(3-amino-1H-pyrazolo[3,4-b]pyridin-1-yl)cyclobutyl)carbamate (2.72 g, 8.97 mmol, 45.1% yield).

Workup

temperatureAfter 1 hour the mixture was cooled
filtrationThe mixture was filtered through a pad of celite
washthe filtrate washed with 10% saturated sodium bicarbonate (500 mL)
dry with materialbefore drying with magnesium sulfate
customevaporating to dryness under reduced pressure
customPurification

Sources & evidence

ORD record: ord-f4e1ef529cb04012ac66626148105e9e
Source dataset: uspto-grants-2015_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09174992B2

Reaction notes

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