Reaction Steps
The compound 10 was prepared following the procedure described for 5 with 4 (0.2 g, 0.62 mmol, 1 eq), pyrrole (0.062 g, 0.93 mmol, 1.5 eq), Cs2CO3 (0.40 g, 1.2 mmol, 2.5 eq), CuI (0.059 g, 0.31 mmol, 0.5 eq) and L2 (0.060 g, 0.31 mmol, 0.5 eq) at 70° C. for 12 h to give crude product which were purified by silica gel column chromatography using ethyl acetate-hexane (9:95) to afford compound 10 as white crystals (0.14 g, 85%): mp 102-105° C. Olefinic protons coupling on the named compound gave an AB-system with a typical roof effect with peaks centered at 7.04 and 6.99 ppm. 1H NMR (300 MHz, CDCl3): 7.62-7.53 (m, 4H, HAr), 7.48-7.40 (m, 2H, HAr), 7.38-7.31 (m, 1H, HAr), 7.17-7.09 (m, 2H, HAr), 7.04 (distorted d, 1H, J=11.1 Hz, (O)—CH═CH(N)), 6.99 (distorted d, 1H, J=11.1 Hz, (O)—CH═CH(N)), 6.82 (dd, 2H, J1=4.2 Hz, J2=2.2 Hz, CH═CH of pyrrole), 6.28 (dd, 2H, J1=4.2 Hz, J2=2.2 Hz, CH═CH); 13C NMR (75 MHz, CDCl3): 156.8, 140.4, 136.3, 135.0, 128.8, 128.4, 127.1, 126.9, 119.6, 118.3, 116.5, 110.0 ppm; IR (cm−1): 3086, 3034, 2715, 2682, 1659, 1607, 1587, 1517, 1485, 1360, 1326, 1300, 1239, 1229, 1185, 1173, 1119, 1094, 1072, 1056, 1007, 975, 907, 857, 838, 614; HRMS (ESI) Calculated for C18H15NO [M+H]+ 262.1232. Found 262.1233; Elemental analysis calculated for C18H15NO.0.17H2O: C, 81.77; H, 5.85; N, 5.29. found: C, 81.76; H, 5.91; N, 5.03.
