Potassium Carbonate → 6-Chloro-1-(4-methoxybenzyl)-3-methylpyrimidine-2,4(1H,3H)-dione

HRID 2389517Notes

Reaction equation

[Cl:1][C:2]1[NH:7][C:6](=[O:8])[N:5]([CH3:9])[C:4](=[O:10])[CH:3]=1.[CH3:11][O:12][C:13]1[CH:20]=[CH:19][C:16]([CH2:17]Cl)=[CH:15][CH:14]=1.C(=O)([O-])[O-].[K+].[K+]>CN(C=O)C>[Cl:1][C:2]1[N:7]([CH2:17][C:16]2[CH:19]=[CH:20][C:13]([O:12][CH3:11])=[CH:14][CH:15]=2)[C:6](=[O:8])[N:5]([CH3:9])[C:4](=[O:10])[CH:3]=1

Participants

Conditions

Temperature: 60 °C

Procedure

A mixture of 6-chloro-3-methylpyrimidine-2,4(1H,3H)-dione (16.2 g, 101 mmol), p-methoxybenzyl chloride (16.5 mL, 122 mmol) and potassium carbonate (7.0 g, 50.7 mmol) in anhydrous DMF (200 mL) is heated at 60° C. for 3 hours. Additional potassium carbonate (3.0 g, 21.7 mmol) is added, and the reaction mixture heated at 60° C. for another 3 hours. After hot filtration, the filtrate is evaporated to dryness under reduced pressure. The obtained oil is directly used for the synthesis in the next step. A small amount of product is further purified by silica-gel flash chromatography to give pure product as crystals. 1H NMR (400 MHz, MeOH-d4) δ 3.37 (s, 3H), 3.83 (s, 3H), 5.24 (s, 2H), 5.96 (s, 1H), 6.91 and 7.32 (AB, 4H, J=6.8 Hz). MS (FAB) m/z 281.23 [M+H]+.

Workup

temperaturethe reaction mixture heated at 60° C. for another 3 hours
filtrationAfter hot filtration
customthe filtrate is evaporated to dryness under reduced pressure
customThe obtained oil is directly used for the synthesis in the next step
customA small amount of product is further purified by silica-gel flash chromatography
customto give pure product as crystals

Sources & evidence

ORD record: ord-7be9d403a56047eb8bafd389399f9845
Source dataset: uspto-grants-2012_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08273750B2

Reaction notes

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