Reaction Steps
Following the general procedure, N-allylaniline (50.0 mg, 0.375 mmol) was treated with butyl vinyl ether (376 mg, 3.75 mmol) and 5 mol % of in situ-generated complex 1a (188 μL, 0.10 M, 18.7 μmol; final substrate concentration=2.0 M) and allowed to stir for 4 h. The unpurified product is 96% Z (as determined by 400 MHz 1H NMR analysis). The resulting oil was purified by silica gel chromatography (50:1 hexanes:Et2O) to afford 8e (40.2 mg, 0.196 mmol , 52.0% yield, 96% Z isomer) as a light yellow oil. IR (neat): 3410 (br), 3048 (w), 2958 (m), 2932 (m), 2871 (m), 1660 (m), 1601 (s), 1503 (s), 1467 (m), 1431(w), 1375 (m), 1314 (m), 1250 (m), 1108 (s), 1094 (s), 1040 (m), 745 (s), 691 (s); 1H NMR (400 MHz, CDCl3): ™ δ 7.19-7.14 (2H, m), 6.72-6.67 (1H, m), 6.66-6.62 (2H, m), [diagnostic E isomer signal: 6.51 (1H, d, J=12.8 Hz)], 6.08 (1H, dt, J=6.4, 1.4 Hz), 4.51 (1H, td, J=6.6, 6.4 Hz), 3.82-3.74 (1H, m), 3.81 (2H, dd, J=6.8, 1.2 Hz), 3.79 (2H, t, J=6.4 Hz), 1.67-1.59 (2H, m), 1.47-1.37 (2H, m), 0.95 (3H, t, J=7.4 Hz); 13C NMR (100 MHz, CDCl3): ™ δ 148.5, 147.4, 129.3, 117.4, 113.2, 103.5, 72.6, 38.6, 32.0, 19.2, 14.0; HRMS (ESI+) [M+H]+ calcd for C13H20NO: 206.1545, found: 206.1541.
