1,1-Dichloroethane → 8-Chloro-1,5-naphthyridin-3-ol

HRID 1513806Notes

Reaction equation

[Cl:1][C:2]1[CH:3]=[CH:4][N:5]=[C:6]2[C:11]=1[N:10]=[CH:9][C:8]([O:12]C)=[CH:7]2.B(Br)(Br)Br.ClC(Cl)C>ClCCl>[Cl:1][C:2]1[CH:3]=[CH:4][N:5]=[C:6]2[C:11]=1[N:10]=[CH:9][C:8]([OH:12])=[CH:7]2

Participants

Conditions

Temperature: 60 °C

Procedure

A pressure-resistant vial was charged with 8-chloro-3-methoxy-1,5-naphthyridine (2.5 g, 12.8 mmol), boron tribromide (13.4 mL, 141.3 mmol) and dichloroethane (0.6M, 21.4 mL). Vessel sealed and mixture stirred at 60° C. for 16 hrs. Next day the reaction mixture was chilled in ice bath and diluted with dichloromethane (200 mL). This was allowed to sit under nitrogen system until all fuming ceased. The resulting yellow solid material was then filtered and dried under high vacuum. This was suspended in 40% (90:10:1 DCM/MeOH/NH4OH)/DCM and purified in this system by ISCO silica gel chromatography (80 g) afford 8-chloro-1,5-naphthyridin-3-ol (1.3 g, 56% yield). MS [M+H]=181.2. Calc'd for C8H5ClN2O=180.59.

Workup

customVessel sealed
temperatureNext day the reaction mixture was chilled in ice bath
filtrationThe resulting yellow solid material was then filtered
customdried under high vacuum
custompurified in this system by ISCO silica gel chromatography (80 g)

Sources & evidence

ORD record: ord-c28c15586c104b17b6a3c82f0f90b9c1
Source dataset: uspto-grants-2012_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08217177B2

Reaction notes

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