Ethanolamine → (e)-3-(5-Bromo-2-methoxy-phenyl)-n-{2-[4-(4-fluoro-benzyl)-4-hydroxy-piperidin-1-yl]-ethyl}-acrylamide

Temperature

20 °C

To a suspension of 2-(formyl-3-methoxyphenoxy)ethyl polystyrene (AMEBA) resin (ex Novabiochem) (1.5 g, 1.05 mmol) in a mixture of trimethylorthoformate/dichloromethane (15 ml, 1:1 v/v) is added 2-amino ethanol (0.317 ml, 5.25 mmol), sodium triacetoxyborohydride (1.113 g, 5.25 mmol) followed by methanol (2 ml) and the mixture shaken for 8 hours at 20° C., then filtered. The resin is washed with methanol, dichloromethane and THF. The dried resin is suspended in THF/acetonitrile (40 ml, 9:1 v/v) and treated with triphenylphosphine (2.75 g, 10.5 mmol), imidazole (0.715 g, 10.5 mmol) and iodine (2.66 g, 10.5 mmol). The suspension obtained is, shaken for 6 hours at 20° C., then filtered. The resin is washed with THF followed by DMF and dried under vacuum. To the freshly prepared resin (1.0 g, 0.7 mmol) suspended in DMF (3 ml) is added 4-(4-fluoro-benzyl)-piperidin-4-ol acetate (0.399 g, 1.4 mmol) and diisopropylethylamine (0.36 g, 2.8 mmol). The mixture is heated at 50° C. for 16 hours and then filtered. The resin is washed with DMF. To the washed resin (0.5 g, 0.35 mmol ) suspended in DMF (3 ml) is added a solution of (E)-3-(5-bromo-2-methoxy-phenyl)-acrylic acid (0.27 g, 1.05 mmol), 2-(1H-benzotriazol-1-yl)-1,1,3,3,-tetramethyluronium tetrafluoroborate (0.34 g, 1.05 mmol), diisopropylethylamine (0.29 g, 1.05 mmol) in DMF (2 ml) and the mixture is shaken at 20° C. for 4 hours, then washed with DMF, methanol and dichloromethane after which it is treated with trifluoroacetic acid/dichloromethane (6 ml, 1:1 v/v) at 20° C. for 1 hour to remove the product from the resin. The resulting mixture is filtered and the filtrate evaporated under vacuum to give the crude product which is purified by preparative HPLC to afford (E)-3-(5-Bromo-2-methoxy-phenyl)-N-{2-[4-(4-fluoro-benzyl)-4-hydroxy-piperidin-1-yl]-ethyl}-acrylamide, as the trifluoroacetate salt, [MH]+ 490.9, 492.8

1. filtrationfiltered
2. washThe resin is washed with methanol, dichloromethane and THF
3. customThe suspension obtained
4. stirringshaken for 6 hours at 20° C.
5. filtrationfiltered
6. washThe resin is washed with THF
7. customdried under vacuum
8. temperatureThe mixture is heated at 50° C. for 16 hours
9. filtrationfiltered
10. washThe resin is washed with DMF
11. stirringthe mixture is shaken at 20° C. for 4 hours
12. washwashed with DMF, methanol and dichloromethane after which it
13. additionis treated with trifluoroacetic acid/dichloromethane (6 ml, 1:1 v/v) at 20° C. for 1 hour
14. customto remove the product from the resin
15. filtrationThe resulting mixture is filtered
16. customthe filtrate evaporated under vacuum
17. customto give the crude product which
18. customis purified by preparative HPLC

ORD record

ord-6a406733cb7243afaf0b4454b6639712

Source dataset

uspto-grants-2007_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07259173B2