Reaktion #522008

Reaktionsgleichung

2-(5-bromo-2-methoxyphenyl)-2-trimethylsiloxyethanenitrile

phosgene

tetrahydrofuran

→

5-(5-Bromo-2-methoxyphenyl)oxazolidine-2,4-dione

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigethe reaction was quenched into 1 liter of crushed ice
2. 2
   Extraktionextracted with two 500 ml
3. 3
   WaschenThe combined ethyl acetate extracts were back washed with two 200 ml
4. 4
   Trocknenportions of brine, dried over anhydrous magnesium sulfate
5. 5
   Filtrationfiltered
6. 6
   Sonstigeevaporated to solids
7. 7
   SonstigeThe solids were recrystallized from toluene
8. 8
   Sonstigeto yield
9. 9
   Sonstigepurified 5-(5-bromo-2-methoxyphenyl)oxazolidine-2,4-dione (10.7 g., m.p. 166°-167° C.)

Vorschrift

By the procedure of Example 3, 2-(5-bromo-2-methoxyphenyl)-2-trimethylsiloxyethanenitrile (16 g., 0.049 mole) in 320 ml. of tetrahydrofuran was reacted with phosgene. After stirring 16 hours at room temperature, the reaction was quenched into 1 liter of crushed ice and extracted with two 500 ml. portions of ethyl acetate. The combined ethyl acetate extracts were back washed with two 200 ml. portions of brine, dried over anhydrous magnesium sulfate, filtered and evaporated to solids. The solids were recrystallized from toluene to yield purified 5-(5-bromo-2-methoxyphenyl)oxazolidine-2,4-dione (10.7 g., m.p. 166°-167° C.)

Quelle