Scheme 6. Synthesis of Target Compounds 23a–p and 24a–l.
Reagents and conditions: (a) HATU, Et3N, DMF, rt, 12 h; (b) SOCl2, DMF, CH2Cl2, reflux, 3 h; (c) Et3N, DMAP, tetrahydrofuran (THF), rt, 3 h.
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