反应详情

Piperidine (0.30 mL, 3.0 mmol) was added to a suspension of 4-(hex-5-ynyloxy)-3-methoxybenzaldehyde (0.70 g, 3.0 mmol) and 2-[(carboxyacetyl)amino]benzoic acid (0.61 g, 2.7 mmol) in toluene (5.0 mL) and treated according to Procedure 2, acidifying with 1 M HCl. The crude product was recrystallised from EtOH/water providing (E)-2-[[3-(4-(Hex-5-ynyloxy)-3-methoxyphenyl)-1-oxo-2-propenyl]amino]benzoic acid (0.78 g, 73%) as a yellow crystalline solid; mp 148-150° C.; δH (400 MHz, DMSO-d6) 1.59 (p, J=7.6 Hz, 2H, CH2), 1.81 (p, J=7.6 Hz, 2H, CH2), 2.24 (dt, J=7.6, 2.4 Hz, 2H, CH2CCH), 2.78 (t, J=2.4 Hz, 1H, CCH), 3.83 (s, 3H, OCH3), 4.01 (t, J=7.6 Hz, 2H, OCH2), 6.77 (d, J=15.6 Hz, 1H, CH═CHCO), 6.98 (d, J5′,6′=8.0 Hz, 1H, H5′), 7.16 (t, J3,4=J4,5=8.0 Hz, 1H, H4), 7.22 (d, J5′,6′=8.0 Hz, 1H, H6′), 7.37 (s, 1H, H2′), 7.55 (d, J=15.6 Hz, 1H, CH═CHCO), 7.61 (t, J4,5=J5,6=8.0 Hz, 1H, H5), 8.00 (d, J3,4=8.0 Hz, 1H, H3), 8.62 (d, J5,6=8.0 Hz, 1H, H6), 11.27 (s, 1H, NH), 13.56 (br s, 1H, CO2H); δC (100 MHz, DMSO-d6) 17.4, 24.6, 27.8, 55.7, 67.6, 71.4, 84.3, 110.7, 112.6, 116.6, 119.8, 120.3, 122.6, 122.7, 127.2, 131.1, 134.0, 141.1, 141.6, 149.1, 150.0, 164.2, 169.4; HRMS (ESI) calculated for C23H23NO5 [M+H]+ 394.1649. found 394.1649; vmax 755, 1237, 1508, 1609, 1669, 2944, 3424, 3567 cm−1.

1. additiontreated
2. customThe crude product was recrystallised from EtOH/water