Scheme 4.
Synthesis of 10: Reagents and Conditions: a) TBDMSCl, imidazole, DCM, 0 °C-rt, 1 h. b) CH3SO2Cl, Et3N, DCM, 0 °C-rt, 2 h. c) TBAF, THF, 0 °C-rt, 1 h. d) K2CO3, CH3OH, 0 °C-rt, 5 h.
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