Scheme 86.
Synthesis of thiazinoquinazoline derivatives 269 and 271. (a) 4-Cl-C6H4CHO, thiourea, AcOH, 100 °C, 4 h; (b) NaOAc, AcOH, (AcO)2O, reflux 10–12 h; (c) EtOH, reflux 5 h.
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