Scheme 1. Synthesis of Compounds 10, 11, and 15.
Reagents and conditions: (i) PCl5, diethyl ether, rt, 2 h; (ii) diethyl ether, rt, 2 h; (iii) 1 M BBr3 solution in CH2Cl2, −70 °C to −40 °C (for 10), or −70 °C to −0 °C (for 11 and 15), 4 h.
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