合成路线1

The reaction of bicyclo[3.2.0]hept-2-en-6-one (I) with 1,3-dibromo-5,5-dimethylhydantoin (DBDMH) in acetic acid gives 3-endo-acetoxy-2-exo-bromo-bicyclo[3.2.0]heptan-6-one (II), which is treated with morpholine in dichloromethane to yield 5-endo-acetoxy-7-anti morpholinobicyclo[2.2.l]heptan-2-one (III). Hydrolysis of (III) with NaOH gives the norbornanone (IV), which is alkylated with biphenyl methylbromide under phase transfer catalysis to give 5-endo[(1,1'-biphenyl)-4 yl]methoxy-7-anti-morpholinobicyclo[2.2.1]heptan 2-one (V). Baeyer-Villiger oxidation followed by partial reduction with diisobutylaluminum hydride (Dibal) gives the aldehyde (VI), which is then homologated to the aldehyde (VII) using methoxymethylenetriphenyl phosphorane and subsequent treatment with 2N HCl. Condensation of (VII) with 3 carboxypropyl triphenylphosphorane in tetrahydrofuran affords the acid (VIII). Finally, this compound is oxidized with Jones' reagent.