Pyridine → HCID 13816784, compound

HRID 344666Notes

Reaction equation

[CH2:1]([O:3][C:4]([C:6]1[C:7](=[O:23])[C:8]2[CH:9]=[C:10]([F:22])[C:11]([F:21])=[C:12]3[O:17][CH2:16][CH:15]([CH2:18][OH:19])[N:14]([CH:20]=1)[C:13]=23)=[O:5])[CH3:2].N1C=CC=CC=1.[N+:30]([C:33]1[CH:34]=[C:35]([CH:39]=[C:40]([N+:42]([O-:44])=[O:43])[CH:41]=1)[C:36](Cl)=[O:37])([O-:32])=[O:31]>O1CCCC1>[CH2:1]([O:3][C:4]([C:6]1[C:7](=[O:23])[C:8]2[CH:9]=[C:10]([F:22])[C:11]([F:21])=[C:12]3[O:17][CH2:16][CH:15]([CH2:18][O:19][C:36](=[O:37])[C:35]4[CH:34]=[C:33]([N+:30]([O-:32])=[O:31])[CH:41]=[C:40]([N+:42]([O-:44])=[O:43])[CH:39]=4)[N:14]([CH:20]=1)[C:13]=23)=[O:5])[CH3:2]

Participants

Conditions

Temperature: 90 °C

Procedure

One gram of (±)-9,10-difluoro-3-hydroxymethyl-7-oxo-2,3-dihydro-7H-pyrido[1,2,3-de][1,4]benzoxazine-6-carboxylic acid ethyl ester (I) and 500 mg of pyridine were suspended in 100 ml of anhydrous tetrahydrofuran (THF), and 1.6 g of 3,5-dinitrobenzoyl chloride was added thereto, followed by refluxing at 90° C. The suspension was once dissolved, and a colorless precipitate was then formed. The reaction was continued for 1.5 hours. After cooling, the precipitate was collected by filtration, washed with methanol and diethyl ether and dried to obtain 1.2 g of (±)-9,10-difluoro-3-(3,5-dinitrobenzoyloxy)methyl-7-oxo-2,3-dihydro-7H-pyrido[1,2,3-de][1,4]benzoxazine-6-carboxylic acid ethyl ester (II) as a colorless powder having a melting point of 240°-242° C.

Workup

dissolutionThe suspension was once dissolved
customa colorless precipitate was then formed
temperatureAfter cooling
filtrationthe precipitate was collected by filtration
washwashed with methanol and diethyl ether
customdried

Sources & evidence

ORD record: ord-e9687ee79f62466481c237715550ff79
Source dataset: uspto-grants-1991_10
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05053407

Reaction notes

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