Scheme 1. Synthetic pathway to compounds 2–8. Reagents and conditions: (i) 140 °C, 1 h; (ii) Ph2O, 240 °C, 2 h; (iii) POCl3, 110 °C, 20 min; (iv) R-SH or R-SNa, K2CO3, THF or DMF, RT, 1.5–24 h.
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