Scheme 4.
Synthesis of BOZs and QZs by the adapted thiourea pathway: (i) toluene, SOCl2, 110 °C; (ii) Synthesis of BOZs toluene, N,N‐dialkylurea, DIPEA, 110 °C (iii); Synthesis of QZs toluene, N,N‐dialkylguanidine, DBU, 110 °C.
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