反应详情

Following the allylic amide cross metathesis general procedure, 2-allylisoindoline-1,3-dione (5.50 mg, 0.0290 mmol) was treated with 1-hexadecene (63.8 mg, 0.290 mmol), 5.0 mol % of in situ-generated complex 2 (75.0 μL, 0.02 M, 1.50 i&mol; final substrate concentration=0.19 M) and allowed to stir for 1 h. The unpurified product is 85% Z (as determined by 400 MHz 1H NMR analysis). The resulting brown oil was purified by silica gel chromatography (96:2:2 hexanes:EtOAc:CH2Cl2) to afford 19g (9.80 mg, 0.0260 mmol, 87.0% yield, 85% Z isomer) as a white, crystalline solid. M.P. 56-60° C.; IR (neat): 2954(w), 2916 (s), 2849 (m), 1771 (w), 1698 (s), 1614 (w), 1464 (m), 1429 (m), 1400 (m), 1356 (w), 1335 (w), 1294 (w), 1189 (w), 1173 (w), 1155 (w), 1089 (w), 1071 (w), 1052 (w), 1024 (w), 962 (m), 930 (m); 1H NMR (400 MHz, CDCl3): 7.84 (2H, dd, J=5.4, 3.0 Hz), 7.70 (2H, dd, J=5.4, 3.0 Hz), 5.78-5.7 1 (1H, m), 5.54-5.44 (1H, m), 4.23 (2H, dd, J=6.2, 0.8 Hz), [diagnostic E isomer signal: 4.22 (1H, d, J=8 Hz)], 1.99 (2H, dd, J=13.6, 6.8 Hz), 1.43-1.19 (24H, m), 0.88 (3H, t, J=6.8 Hz); 13C NMR (100 MHz, CDCl3): 168.2, 135.6, 134.0, 132.4, 123.4, 123.3, 123.1, 77.4, 39.8, 32.3, 32.1, 29.9, 29.8, 29.8, 29.7, 29.7, 29.6, 29.6,−29.5, 29.3, 29.0,22.8, 14.3; HRMS (ESI+) [M+H]+ calcd for C25H38NO2: 384.2903, found: 384.2905.

1. customThe resulting brown oil was purified by silica gel chromatography (96:2:2 hexanes:EtOAc:CH2Cl2)