1-Bromo-4-(trifluoromethoxy)benzene → 1-(Tert-butoxycarbonyl)-4-[[4-(trifluoromethoxy)phenyl]amino]piperidine

Tris(dibenzylideneacetone)dipalladium (30 mg; 0.03 mmol), 2,2′-bis(diphenylphosphino)-1,1′-binaphthyl (62 mg; 0.1 mmol), sodium tert-butoxide (240 mg; 2.5 mmol), 1-bromo-4-trifluoromethoxy-benzene (410 mg; 1.7 mmol) and 4-amino-piperidine-1-carboxylic acid tert-butyl ester (421 mg; 2.1 mmol) are suspended in dry toluene (5 mL) and the mixture is irradiated in a mono-mode microwave oven for 30 minutes at 120° C. The mixture is then cooled down to room temperature, is diluted with ethyl acetate (15 mL), filtered over Celite and concentrated under reduced pressure. The crude residue is then diluted in dichloromethane (15 mL) and filtered over a short silica gel pad. The desired product is eluted from the silica gel pad (dichloromethane (150 mL) followed by dichloromethane:methanol 98:2 (100 mL)). The fractions of interest are collected, pooled and concentrated under reduced pressure to afford the desired product (396 mg; 1.1 mmol).

1. customthe mixture is irradiated in a mono-mode microwave oven for 30 minutes at 120° C
2. filtrationfiltered over Celite
3. concentrationconcentrated under reduced pressure
4. additionThe crude residue is then diluted in dichloromethane (15 mL)
5. filtrationfiltered over a short silica gel pad
6. washThe desired product is eluted from the silica gel pad (dichloromethane (150 mL) followed by dichloromethane:methanol 98:2 (100 mL))
7. customThe fractions of interest are collected
8. concentrationconcentrated under reduced pressure

ORD-Eintrag

ord-f5fb15e956b5417593a7a9f8ee985fac

Quelldatensatz

uspto-grants-2015_08

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09096524B2