反应详情

Piperidine (0.42 mL, 4.2 mmol) was added to a suspension of 4-methoxybenzaldehyde (0.51 mL, 4.2 mmol) and 2-[(carboxyacetyl)amino]benzoic acid (0.83 g, 3.7 mmol) in toluene (5.0 mL) and treated according to Procedure 2, acidifying with 1 M HCl. (E)-2-[[3-(4-Methoxyphenyl)-1-oxo-2-propenyl]amino]benzoic acid (0.95 g, 86%) was obtained as a pale yellow crystalline solid; mp 194-195° C., lit. [24] 195-198° C.; δH (500 MHz, DMSO-d6) 3.80 (s, 3H, OCH3), 6.72 (d, J=15.5 Hz, 1H, CH═CHCO), 6.98 (d, J2′,3′=J5′,6′=9.0 Hz, 2H, H3′, H5′), 7.16 (t, J3,4=J4,5=8.0 Hz, 1H, H4), 7.57 (d, J=15.5 Hz, 1H, CH═CHCO), 7.60 (t, J4,5=J5,6=8.0 Hz, 1H, H5), 7.68 (d, J2′,3′=J5′,6′=9.0 Hz, 2H, H2′, H6′), 7.99 (d, J3,4=8.0 Hz, 1H, H3), 8.60 (d, J5,6=8.0 Hz, 1H, H6), 11.28 (s, 1H, NH).

1. additiontreated