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(a) (i) 14a or 14b, MSTFA, THF; (ii) 6b, CSI, DCM, 0 °C; (iii) THF, 0 °C − rt; (b) Pd black, H2, EtOH; (c) TFA, DCM 0 °C; (d) BCl3, DCM; (e) (i) Pd black, H2 (1 atm), THF; (ii) MSTFA, THF; (f) (i) 5, CSI, DCM, 0 °C; (ii) THF, 0 °C − rt.
