Scheme 2.
Synthetic protocol for 7 and 23. Reagents and conditions: (a) K2CO3, PMB-Cl, ACN, 22%; (b) CuI, DMSO, 4-methylbenzenesulfinate, 90 °C, 22%; (c) TFA, rt, 92%; (d) NBS, CHCl3, 85%.
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