Scheme 1.
Synthesis of chlorins M1–M6 from MPPa: (a) HCl, acetone; (b) Zn(OAc)2·2H2O, MeOH/THF; (c) OsO4, NaIO4, dioxane-AcOH-water; (d) Ph3P=CHCOOtBu, CH2Cl2; (e) CF3COOH; and (f) NCCH2COOH, piperidine-THF.
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