N-bromobutanimide → 4-(bromomethyl)-6-chloro-3-methoxy-1-trityl-1H-pyrazolo[4,3-c]pyridine

HRID 588088Notes

Reaction equation

[Cl:1][C:2]1[N:7]=[C:6]([CH3:8])[C:5]2[C:9]([O:31][CH3:32])=[N:10][N:11]([C:12]([C:25]3[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=3)([C:19]3[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=3)[C:13]3[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=3)[C:4]=2[CH:3]=1.C1C(=O)N([Br:40])C(=O)C1>C(Cl)(Cl)(Cl)Cl.C(Cl)Cl>[Br:40][CH2:8][C:6]1[C:5]2[C:9]([O:31][CH3:32])=[N:10][N:11]([C:12]([C:13]3[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=3)([C:19]3[CH:20]=[CH:21][CH:22]=[CH:23][CH:24]=3)[C:25]3[CH:26]=[CH:27][CH:28]=[CH:29][CH:30]=3)[C:4]=2[CH:3]=[C:2]([Cl:1])[N:7]=1

Participants

Conditions

Temperature: 70 °C

Procedure

6-Chloro-3-methoxy-4-methyl-1-trityl-1H-pyrazolo[4,3-c]pyridine (1.5 g, 3.41 mmol) was dissolved in CCl4 (10 mL), charged with NBS (637 mg, 3.58 mmol) and AlBN (56.0 mg, 0.341 mmol), and heated to 70° C. overnight. The reaction was diluted with DCM (10 mL) and purified by flash chromatography (5-25% EtOAc/hexanes) to give 4-(bromomethyl)-6-chloro-3-methoxy-1-trityl-1H-pyrazolo[4,3-c]pyridine. MS ESI calc'd. for C27H21BrClN3O [M+1]+519. found 519.

Workup

custompurified by flash chromatography (5-25% EtOAc/hexanes)

Sources & evidence

ORD record: ord-df5050c4d9134430a27d1efe6361b819
Source dataset: uspto-grants-2016_01
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09226922B2

Reaction notes

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