N,N-Dimethylaniline → Benzyl 3-[4-(3-methoxypropyl)-3,4-dihydro-2H-benzo[1,4]oxazin-6-ylmethoxy]-4-[4-(3-phenylpyrrolidine-1-carbonyloxy)phenyl]piperidine-1-carboxylate

The stirred solution of 0.250 g of benzyl 4-(4-hydroxyphenyl)-3-[4-(3-methoxypropyl)-3,4-dihydro-2H-benzo[1,4]oxazin-6-ylmethoxy]piperidine-1-carboxylate in 2.5 ml of toluene is admixed at 0° C. with 0.131 ml of N,N-dimethylaniline and 0.65 ml of phosgene solution (20% in toluene). The reaction mixture is stirred at room temperature over 24 hours. The resulting suspension is diluted with tert-butyl methyl ether (20 ml) and washed successively with 0.1M HCl (20 ml), 1M sodium hydrogencarbonate solution (20 ml) and water, dried over sodium sulphate, filtered and concentrated by evaporation. The residue is dissolved in 1.0 ml of ethyl acetate and added to the stirred cold mixture of 0.177 g of 3-phenylpyrrolidine, 1.80 ml of ethyl acetate and 1M sodium hydrogencarbonate solution. The mixture is stirred at 0° C. over 1 hour. The reaction mixture is poured onto brine (50 ml) and extracted with ethyl acetate (2×50 ml). The organic phases are dried over sodium sulphate, filtered and concentrated by evaporation. The title compound is obtained as a white solid from the residue by means of flash chromatography (SiO2 60F). Rf=0.16 (1:1 EtOAc-heptane); Rt=5.87.

1. washwashed successively with 0.1M HCl (20 ml), 1M sodium hydrogencarbonate solution (20 ml) and water
2. dry with materialdried over sodium sulphate
3. filtrationfiltered
4. concentrationconcentrated by evaporation
5. dissolutionThe residue is dissolved in 1.0 ml of ethyl acetate
6. additionadded to the stirred cold mixture of 0.177 g of 3-phenylpyrrolidine, 1.80 ml of ethyl acetate and 1M sodium hydrogencarbonate solution
7. stirringThe mixture is stirred at 0° C. over 1 hour
8. additionThe reaction mixture is poured onto brine (50 ml)
9. extractionextracted with ethyl acetate (2×50 ml)
10. dry with materialThe organic phases are dried over sodium sulphate
11. filtrationfiltered
12. concentrationconcentrated by evaporation

ORD-Eintrag

ord-ba9469eadd7849f18b7139dc446c891d

Quelldatensatz

uspto-grants-2010_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07790715B2