Scheme 7.
Reagents and conditions: (a) EtMgBr, THF, 0 °C, 51% (b) i) LiHMDs, ethyl acetate, THF, −78 °C; ii) TFA, CH2CI2; iii) MeOH, Et3N; iv) Me2SO4, NaH, THF; v) BMS, THF, 17% over five steps
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