(3S)-(-)-3-(tert-Butoxycarbonylamino)pyrrolidine → HCID 59211979, compound

Participants

Reaction Steps

To a solution of 4-(3-phenoxyphenyl)morpholine-2,6-dione 26 (4.7 g, 0.0166 mol) in THF (50 mL) was added (3S)-(−)-3-(tert-butoxycarbonylamino)pyrrolidine (4.11 g, 0.0221 mol). The reaction mixture was stirred for 3 days after which time a precipitate had formed. This material was collected by filtration, then washed with ethyl acetate to give the first crop of the title compound. A further crop was obtained by evaporating the filtrate in vacuo. The resultant residue was dissolved in ethyl acetate, washed with 10% hydrochloric acid and brine, dried (Na2SO4) and concentrated in vacuo. The second crop of title compound which precipitated was collected by filtration to give a total yield of 4.36 g (50%), as a cream solid. 1HNMR (300 MHz) (d6-DMSO, 100° C.)) δ 1.43 (9H, s), 1.75-2-20 (2H, 2×m), 2.75-3.1 (1H, br), 3.20-3.75 (4H, m), 4.09 (2H, s), 4.21 (2H, s), 6.22 (1H, br s), 6.37 2H, br t), 6.70 (1H, br), 6.99 (2H, d), 7.14 (2H, m) and 7.37 (2H, br t).

Provenance & Evidence