Reaktion #168947

Reaktionsgleichung

NaOMe

guanidine carbonate

2-(2-isopropyl-4-methoxy-5-methyl-phenoxy)-3-methoxy-acrylic acid ethyl ester

→

2-amino-5-(2-isopropyl-4-methoxy-5-methyl-phenoxy)-3H-pyrimidin-4-one

Ausbeute 22.0%

Lösungsmittel

DMSO

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturwas cooled
2. 2
   Sonstigepartitioned between ethyl acetate and water
3. 3
   WaschenThe organic phase was washed with brine
4. 4
   Trocknendried over anhydrous sodium sulfate
5. 5
   SonstigeAfter removal
6. 6
   Sonstigeof drying agent
7. 7
   Einengenthe organic solution was concentrated under reduced pressure
8. 8
   SonstigeThe residue was purified with silica gel chromatography (5% methanol in methylene chloride/0.1% concentrated NH4OH)

Vorschrift

To a solution of NaOMe [prepared from sodium (0.05 g, 2.17 mmol) in anhydrous methanol (5 ml)], was added guanidine carbonate. After 5 minutes, a solution of 2-(2-isopropyl-4-methoxy-5-methyl-phenoxy)-3-methoxy-acrylic acid ethyl ester (0.22 g, 0.713 mmol) in anhydrous DMSO (10 ml) was added. The mixture was heated at 120° C. for 3 hours and was cooled and partitioned between ethyl acetate and water. The organic phase was washed with brine and dried over anhydrous sodium sulfate. After removal of drying agent, the organic solution was concentrated under reduced pressure. The residue was purified with silica gel chromatography (5% methanol in methylene chloride/0.1% concentrated NH4OH) to yield 2-amino-5-(2-isopropyl-4-methoxy-5-methyl-phenoxy)-3H-pyrimidin-4-one as pale yellow solid (0.045 g, 22%). MS M+H=290.

Quelle