Scheme 1.

Synthesis of compounds 3–22.
Reagents and conditions: i) 15% K2CO3, i-propanol, refluxing, 24 h. ii) SOCl2, Et3N, CHCl3, refluxing, 5 h. iii) amine or alcohol materials, DMAP, CHCl3, refluxing, 5 h.

Synthesis of compounds 3–22.
Reagents and conditions: i) 15% K2CO3, i-propanol, refluxing, 24 h. ii) SOCl2, Et3N, CHCl3, refluxing, 5 h. iii) amine or alcohol materials, DMAP, CHCl3, refluxing, 5 h.