Reaktion #9965

Reaktionsgleichung

5-Fluoro-2-methyl-6-nitrobenzoxazole

methanol

→

6-Amino-5-Fluoro-2-Methylbenzoxazole

Lösungsmittel

tetrahydrofuran

Reaktionsbedingungen

Aufarbeitung

1. 1
   WaschenRaney-Nickel which had been pre-washed with water (×3) and tetrahydrofuran (×3)
2. 2
   workup.ADDITIONwas added
3. 3
   Sonstigewas then hydrogenated at room temperature
4. 4
   workup.WAITAfter this period
5. 5
   Filtrationthe catalyst is filtered off
6. 6
   Einengenthe solution concentrated under reduced pressure
7. 7
   SonstigeThe residue is triturated with heptane
8. 8
   Temperaturcooled
9. 9
   Filtrationthe solid filtered off

Vorschrift

5-Fluoro-2-methyl-6-nitrobenzoxazole (16 g, 81.57 mMole), was dissolved in tetrahydrofuran (150 mL), and methanol (50 mL). Raney-Nickel which had been pre-washed with water (×3) and tetrahydrofuran (×3), was added and the mixture was then hydrogenated at room temperature and 50 psi of hydrogen. The reaction is complete in approximately 1.5 hours. After this period, the catalyst is filtered off and the solution concentrated under reduced pressure. The residue is triturated with heptane, cooled and the solid filtered off. Yield 12 g.

Quelle