2,4,5-Trichloropyrimidine → 2,5-Dichloro-4-methoxypyrimidine

Sodium methoxide (295 mg, 5.45 mmol) was taken up in methanol (13.6 mL) and 2,4,5-trichloropyrimidine (500 mg, 2.73 mmol) was added. The mixture was stirred at room temperature overnight. The resulting mixture was concentrated under reduced pressure. The resulting residue was diluted with diethyl ether, washed with 1:1 water:saturated aqueous ammonium chloride. The organic layer was dried over magnesium sulfate, filtered, and concentrated under reduced pressure. Purification by Chromatography on silica gel (0-10% diethyl ether/hexanes) afforded 2,5-dichloro-4-methoxypyrimidine (280 mg, 1.56 mmol, 57%) as a white solid.

1. concentrationThe resulting mixture was concentrated under reduced pressure
2. additionThe resulting residue was diluted with diethyl ether
3. washwashed with 1:1 water
4. dry with materialThe organic layer was dried over magnesium sulfate
5. filtrationfiltered
6. concentrationconcentrated under reduced pressure
7. customPurification by Chromatography on silica gel (0-10% diethyl ether/hexanes)

ORDレコード

ord-506c0e0267bb46e38895ffb9ee233eb4

出典データセット

uspto-grants-2014_06

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US08759366B2