Sodium Hydroxide → 1-(1-Phenylethyl)-3-[4-(trifluoromethyl)phenoxy]azetidine

Temperatur

90 °C

The maleate salt of 1-(α-methylbenzyl)-3-hydroxyazetidine (78.6 g., 0.20 mole) was partitioned between benzene and dilute sodium hydroxide, the benzene layer dried, filtered, and concentrated at reduced pressure. The residue was dissolved in 100 ml. of dry dimethylformamide and added at a rapid dropwise rate, to a stirring suspension of 10.1 g. (0.22 mole) of sodium hydride (50% in mineral oil) in 150 ml. of dry dimethylformamide at 90° C. The solution was heated at 90° C. for one hour and then treated dropwise with 32.0 g. (0.20 mole) of 4-trifluoromethylfluorobenzene. The solution was refluxed for three hours. The cooled solution was partitioned between water and isopropyl ether, and the ether layer extracted with dilute hydrochloric acid. The aqueous acid layer was made basic with concentrated sodium hydroxide and ice, and extracted with isopropyl ether. The ether layer was concentrated and the residue distilled at 150°-160° C./0.2 mm. to give 25.6 g. of product.

1. dry with materialthe benzene layer dried
2. filtrationfiltered
3. concentrationconcentrated at reduced pressure
4. dissolutionThe residue was dissolved in 100 ml
5. additionof dry dimethylformamide and added at a rapid dropwise rate, to a stirring suspension of 10.1 g
6. customat 90° C
7. additiontreated dropwise with 32.0 g
8. temperatureThe solution was refluxed for three hours
9. customThe cooled solution was partitioned between water and isopropyl ether
10. extractionthe ether layer extracted with dilute hydrochloric acid
11. extractionextracted with isopropyl ether
12. concentrationThe ether layer was concentrated
13. distillationthe residue distilled at 150°-160° C./0.2 mm
14. customto give 25.6 g

ORD-Eintrag

ord-04f236c28cae491b9817dd38ec39ff76

Quelldatensatz

uspto-grants-1983_04

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US04379151