Figures & data
Scheme 1. Synthesis of compounds 6a–t. Reagents and conditions: (a) SOCl2, EtOH, rt, 12 h. (b) CH3C(OCH3)2CH3, p-TsOH, benzene, 80 °C; dioxine, H2O, NaOH. (c) SOCl2, CHCl3, 40–50 °C, 4 h. (d) xylol, p-TsOH, 145 °C. (e) DCC, HOBt, DMAP, CH2Cl2. (f) DCC, HOBt, DMAP, CH2Cl2;50%CF3COOH, 35 °C.
![Scheme 1. Synthesis of compounds 6a–t. Reagents and conditions: (a) SOCl2, EtOH, rt, 12 h. (b) CH3C(OCH3)2CH3, p-TsOH, benzene, 80 °C; dioxine, H2O, NaOH. (c) SOCl2, CHCl3, 40–50 °C, 4 h. (d) xylol, p-TsOH, 145 °C. (e) DCC, HOBt, DMAP, CH2Cl2. (f) DCC, HOBt, DMAP, CH2Cl2;50%CF3COOH, 35 °C.](/cms/asset/d2774692-94b6-4318-9960-fcb5d0e0c691/ienz_a_1016511_f0006_b.jpg)