[C:1]([O:5][C:6](=[O:17])[NH:7][C@@H:8]([C:10]1[CH:15]=[CH:14][CH:13]=[C:12](Br)[CH:11]=1)[CH3:9])([CH3:4])([CH3:3])[CH3:2].[CH2:18]([Sn](CCCC)(CCCC)C=C)[CH2:19]CC>C1(C)C=CC=CC=1.[Pd].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1>[C:1]([O:5][C:6](=[O:17])[NH:7][C@@H:8]([C:10]1[CH:15]=[CH:14][CH:13]=[C:12]([CH:18]=[CH2:19])[CH:11]=1)[CH3:9])([CH3:4])([CH3:3])[CH3:2]A solution of [(R)-1-(3-bromo-phenyl)-ethyl]-carbamic acid tert-butyl ester (10.26 g, 0.0342 mol.) and tributyl(vinyl)stannane (32.5 g, 30 mL, 0.103 mol.) in toluene (175 mL) was purged with nitrogen for 30 minutes before addition of bis(triphenylphosphine palladium II chloride (2.38 g, 0.0034 mol.). The stirred mixture was heated to 60° C. for 16 hours before cooling to room temperature. The reaction mixture was filtered through hyflo-supercel then evaporated to give a dark coloured oil. The oil was purified by silica gel chromatography using iso-hexanes/ethyl acetate 19:1 to yield the title compound (6.95 g, 82%) as a yellow oil. 1H NMR (300 MHz, CDCl3) δ1.39-1.51 (m, 12H), 4.80 (br s, 2H), 5.24-5.32 (m, 1H), 5.77 (d, J=17.6 Hz, 1H), 6.73 (dd, J=17.6, 10.9 Hz, 1H), 7.18-7.36 (m, 4H).
Wird geladen…
