Reaction Steps
The reaction of hydroxylamine 55 (1.98 g, 5 mmol) with 4-chlorobenzaldehyde (62) (0.70 g, 5 mmol) afforded, after workup, a light yellow oil. The crude product was purified by flash chromatography with 1:1 ethyl acetate/petroleum ether as the eluant to obtain 1.97 g (3.74 mmol, 75%) of 73 as a light yellow gum: IR (CH2Cl2) 3440, 2980, 1700, 1625, 1590, 1550, 1475, 1300, 1215, 1110, 910, 840; 1H NMR 1.10 (d, J=6.2 Hz, 3H), 1.22 (d, J=6.2 Hz, 3H), 2.26 (s, 6H), 3.31 (s, 3H), 3.56 (t, J=4.8 Hz, 2H), 4.18 (m, 2H), 4.93 (septet, J=6.2 Hz, 1H), 5.06 (s, 1H), 6.79 (s, 1H) 7.28-8.33 (m, 9H); 13C NMR (CDCl3) δ 19.77, 19.89, 22.48, 22.71, 40.52, 59.32, 63.35, 67.74, 71.21, 103.29, 104.13, 119.97, 122.02, 129.05, 129.52, 129.81, 130.85, 134.35, 136.94, 145.43, 146.25, 149.25, 150.39, 167.56, 168.01. Anal. Calcd for C28H31N2O6Cl; C, 63.81; H, 5.88. Found: C, 63.86; H, 5.84.
