Research Article
Synthesis of New Benzofuran-2-Carboxylic Acid Derivatives
Scheme 2
A: K2CO3 (1.5 equiv.), DMF, 92–94°C, 4 h; B: K2CO3 (1.3 equiv.), DMF, 92–94°C; C: H2, Pd/C, CH3OH, DME, 3.5 h; D: NH2CH3, NH4Cl, CH3OH, 48 h; E: CH3OH, 6-7°C, 2 weeks; F: SOCl2, CH2Cl2, 24 h.
