Reaction Steps
Following the general procedure, allyl benzene (50.0 mg, 0.423 mmol, 7) was treated with p-methoxyphenyl vinyl ether (127 mg, 8.46 mmol) and 1.2 mol % of in situ-generated complex la (51.0 μL, 0.10 M, 5.08 μmol; final substrate concentration=8.3 M) and allowed to stir for 16 h. The unpurified product is >98% Z (as determined by 400 MHz 1H NMR analysis). Excess p-methoxyphenyl vinyl ether was removed by vacuum distillation (1.0 torr, 80° C.). The resulting oil was purified by neutral alumina chromatography (100% hexanes to 100:1 hexanes:Et2O) to afford 10a (56.8 mg, 0.236 mmol, 56.0% yield, >98% Z isomer) as a colorless oil. IR (neat): 3027 (w), 3000 (w), 2950 (w), 2908 (w), 2834 (w), 1664 (m), 1502 (s), 1464 (m), 1453 (m), 1441 (m), 1384 (m), 1212 (s), 1179 (m), 1088 (m), 1064 (m), 1034 (m), 989 (m); NMR (400 MHz, CDCl3): δ 7.33-7.25 (4H, m), 7.24-7.18 (1H, m), 7.01-6.95 (2H, m), 6.89-6.84 (2H, m), 6.42 (1H, dt, J=6.0, 1.6 Hz), 4.96 (1H, td, J=7.6, 6.0 Hz), 3.80 (3H, s), 3.58 (2H, dd, J=7.6, 1.2 Hz); 13C NMR (100 MHz, CDCl3): δ 155.4, 151.7, 141.9, 141.2, 128.6, 128.5, 126.0, 117.6, 114.8, 110.6, 55.9, 30.4; HRMS (ESI+) [M+NH4]+ calcd for C16H20NO2. 258.1494, found: 258.1491.
