Pyridine → N-(5-bromopyridin-2-yl)-2-nitrobenzamide

HRID 2362778

Reaktionsgleichung

Reaktionsgleichung von HRID 2362778
[N+:1]([C:4]1[CH:12]=[CH:11][CH:10]=[CH:9][C:5]=1[C:6](Cl)=[O:7])([O-:3])=[O:2].[NH2:13][C:14]1[CH:19]=[CH:18][C:17]([Br:20])=[CH:16][N:15]=1.N1C=CC=CC=1>C(Cl)Cl>[Br:20][C:17]1[CH:18]=[CH:19][C:14]([NH:13][C:6]([C:5]2[CH:9]=[CH:10][CH:11]=[CH:12][C:4]=2[N+:1]([O-:3])=[O:2])=[O:7])=[N:15][CH:16]=1

Komponenten

5

Edukt 3

HCID 1049PyridineHCID 118752-Nitrobenzoyl chlorideHCID 706222-Amino-5-bromopyridine

Produkt 1

HCID 679218N-(5-bromopyridin-2-yl)-2-nitrobenzamideAusbeute 77,9 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 6344DichloromethaneLösungsmittel

Versuchsvorschrift

A solution of 2-nitrobenzoyl chloride (3.70 g, 20 mmol, 1.0 equiv), 2-amino-5-bromopyridine (3.50 g, 1.0 equiv), pyridine (10 mL) in 25 mL of methylene chloride was stirred overnight. The volatile was evaporated, flash chromatography on silica gel gave N-(5-bromo-2-pyridinyl)-(2-nitro)phenylcarboxamide (5.02 g, 77%). MS found for C12H9BrN3O3 (M+H)+: 322. Step 2: A solution of N-(5-bromo-2-pyridinyl)-(2-nitro)phenylcarboxamide (1.0 g, 3.1 mmol, 1.0 equiv) in 30 mL of EtOAc was treated with SnCl2.2H2O (2.80 g, 4 equiv) at reflux for 4 h. The volatile was evaporated and the residue was redissolved in EtOAc, washed with saturated aqueous NaHCO3 and 1N NaOH. The organic layer was dried over MgSO4, filtered and evaporated to N-(5-bromo-2-pyridinyl)-(2-amino)phenylcarboxamide (0.89 g, 98%). MS found for C12H11BrN3O (M+H)+: 292. Step 3: A mixture of N-(5-bromo-2-pyridinyl)-(2-amino)phenylcarboxamide (292 mg, 1 mmol, 1.0 equiv), 4-[(2-t-butylaminosulfonyl)phenyl]benzoyl chloride (349 mg, 1 equiv), pyridine (3 mL) in 10 mL of dichloromethane was stirred at rt overnight, washed with H2O. The organic layer was dried over MgSO4, filtered, evaporated and refluxed in 2 mL of trifluoroacetic acid for 30 min. TFA was then evaporated and HPLC (C18 reversed phase) eluting with 0.5% TFA in H2O/CH3CN gave N-(5-bromo-2-pyridinyl)-(2-4-[(2-aminosulfonyl)phenyl]phenylcarbonylamino)phenylcarboxamide (470 mg, 85%). MS found for C25H20BrN4O4S (M+H)+: 551.

Aufarbeitung

  1. customThe volatile was evaporated

Quellen und Nachweise

ORD-Eintrag
ord-ffcce93ea1b540ac9a6ec4e0d10cf00e
Quelldatensatz
uspto-grants-2014_04
Patentnummer
US08691847B2

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