Water → 7-bromo-3-chloro-1-fluoro-5-methyl-5H-chromeno[2,3-c]pyridin-5-ol

HRID 455589Notes

Reaction equation

[Br:1][C:2]1[CH:3]=[C:4]2[C:15](=[CH:16][CH:17]=1)[O:14][C:7]1[C:8]([F:13])=[N:9][C:10]([Cl:12])=[CH:11][C:6]=1[C:5]2=[O:18].[CH3:19][Mg]Br.[NH4+].[Cl-].O>C1COCC1>[Br:1][C:2]1[CH:3]=[C:4]2[C:15](=[CH:16][CH:17]=1)[O:14][C:7]1[C:8]([F:13])=[N:9][C:10]([Cl:12])=[CH:11][C:6]=1[C:5]2([CH3:19])[OH:18]

Participants

Conditions

Temperature: 0 °C

Procedure

A suspension of 7-bromo-3-chloro-1-fluoro-5H-chromeno[2,3-c]pyridin-5-one (35 g, 107 mmol) in dry THF (210 mL) under nitrogen atmosphere was cooled to 0° C. and a solution of methylmagnesium bromide (3.0M solution in diethyl ether; 107 mL, 320 mmol) in dry THF (70 mL) was added over 10 minutes via an addition funnel. After complete addition a saturated aqueous solution of NH4Cl (125 mL) was added slowly to the stirring reaction mixture, keeping the internal temperature below 30° C. Water was added and the mixture was extracted twice with EtOAc. The combined organic layers were dried over sodium sulfate before concentrating under reduced pressure to afford 7-bromo-3-chloro-1-fluoro-5-methyl-5H-chromeno[2,3-c]pyridin-5-ol (34.33 g, 100 mmol).

Workup

additionwas added slowly to the stirring reaction mixture
customthe internal temperature below 30° C
extractionthe mixture was extracted twice with EtOAc
dry with materialThe combined organic layers were dried over sodium sulfate
concentrationbefore concentrating under reduced pressure

Sources & evidence

ORD record: ord-10d9de1c473f4d46a69c05b199c97083
Source dataset: uspto-grants-2013_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08497264B2

Reaction notes

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