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a
a (a) CClF2COOMe, Cs2CO3, DMF; (b) (i) method A, R1OH or R2OH, PPh3, t-BuO2CN=NCO2-t-Bu, THF; method B, R1Br or R2Br, CsCO3, DMF; (c) R3Li or R3MgBr, THF, −78 °C; (d) PCC, DCM; (e) R4Br, n-BuLi, THF, −78 °C; (f) AcOH, H2SO4, 80 °C; (g) H2, Pd/C, room temp.
