Scheme 2.
Modifications performed on 3 to obtain compounds 9–12.
Conditions and reagents: a. LTA (lead IV acetate), PhH, Reflux; b. m-CPBA, CH2Cl2, r.t, 1.5 h; c. MeONa, MeOH, N2, r.t, 2 h; d. PDC, CH2Cl2, N2, r.t, 1.5 h.
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