Nitrite → 4-Fluoromethamphetamine

A solution of 8.2 g. (0.05 mole) of (±)-N-methyl-2-(4-amino-phenyl)-1-methyl-ethyl amine (HU-PS 154,060) in 30 ml. 56% fluoroboric acid and 3.5 g. (0.051 mole) of sodium nitrite in 25 ml. water are simultaneously dropped into 100 ml. of 56% fluoro boric acid under stirring and cooling at -5°-(-7°)C. so that a small excess of nitrite solution is maintained in the reaction mixture during the addition. The mixture is then stirred for a further 30 minutes at -5°-(-7°)C. and in small portions 2.5 g. freshly prepared copper (I) chloride is added to the solution. The mixture is stirred for 2 hours at room temperature and stirred for 80°-90° C. for 2 hours. After cooling the mixture is extracted with ether and the aqueous acid layer is alkalized with conc. ammonium hydroxide and extracted with benzene. The benzene extract is evaporated after drying and the residue is distilled at 10 mmHg. As a main cut 5.6 g. (±)-N-methyl-2-(4-fluorophenyl)-1-methyl-ethyl-amine (boiling point: 87°-90° C./10 mmHg) obtained which are reacted according to Example 2 with propargyl bromide and processed according to Example 2. 3.8 g. (±)-N-methyl-N-propynyl-2-(4-fluoro-phenyl)-1-methyl-ethyl-amine are obtained. Bp.: 120°-123° C./2 mmHg, nD20 =1.5054.

1. temperaturecooling at -5°-(-7°)C
2. stirringThe mixture is stirred for 2 hours at room temperature
3. stirringstirred for 80°-90° C. for 2 hours
4. temperatureAfter cooling the mixture
5. extractionis extracted with ether
6. extractionextracted with benzene
7. extractionThe benzene extract
8. customis evaporated
9. customafter drying
10. distillationthe residue is distilled at 10 mmHg

ORDレコード

ord-69d60d1f73ca431da2f2026856d3d661

出典データセット

uspto-grants-1990_10

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US04960797