Pyridine → Ethyl 1-(4-fluorophenyl)-4,6-dimethyl-2-oxo-1,2-dihydropyridine-3-carboxylate

HRID 2195535Notes

Reaction equation

[CH3:1][C:2]1[CH:7]=[C:6]([CH3:8])[NH:5][C:4](=[O:9])[C:3]=1[C:10]([O:12][CH2:13][CH3:14])=[O:11].[F:15][C:16]1[CH:21]=[CH:20][C:19](B(O)O)=[CH:18][CH:17]=1.N1C=CC=CC=1>O1CCOCC1>[F:15][C:16]1[CH:21]=[CH:20][C:19]([N:5]2[C:6]([CH3:8])=[CH:7][C:2]([CH3:1])=[C:3]([C:10]([O:12][CH2:13][CH3:14])=[O:11])[C:4]2=[O:9])=[CH:18][CH:17]=1

Participants

Conditions

Temperature: 80 °C

Procedure

A suspension of ethyl 4,6-dimethyl-2-oxo-1,2-dihydropyridine-3-carboxylate (5.0 g, 0.025 mol), 4-fluorophenylboronic acid (10.7 g, 0.077 mol), cupric acetate (1.33 g, 0.007 mol), pyridine (6.86 mL), and 4 A molecular sieves (5.0 g) in 1,4-dioxane (80 mL) is heated at 80° C. for 68 hours. The solids are filtered off and the filtrate is concentrated. The residue is partitioned with EtOAc (50 mL) and 2N HCl (70 mL). The precipitated solid is collected by filtration and washed with EtOAc to give the title product (1.2 g). The EtOAc filtrate is separated, dried and concentrated. The residue is purified by silica gel column chromatography eluting with PE:EtOAc:MeOH (40:20:1) to give another portion of product (0.12 g), (1.32 g total, 17.8% yield). MS (m/z): 290.1 (M+H).

Workup

filtrationThe solids are filtered off
concentrationthe filtrate is concentrated
customThe residue is partitioned with EtOAc (50 mL) and 2N HCl (70 mL)
filtrationThe precipitated solid is collected by filtration
washwashed with EtOAc

Sources & evidence

ORD record: ord-2eece15bb868492e885db24154f98c9c
Source dataset: uspto-grants-2012_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: USRE043878E1

Reaction notes

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