合成路线1

Tosylation of the primary hydroxyl group of (I) affords tosylate (II), which is then subjected to reaction with MeSNa and tetrabutylammonium iodide (n-Bu4NI) in THF followed by oxidation with NaIO4 in MeOH/H2O to provide sulfoxide (III). Derivative (III) is then heated with K2CO3 in 1,2-dichlorobenzene to yield olefin (IV), which is subjected to reaction with triethylsilyl chloride (TESCl) and imidazole in DMF to give the disilylated compound (V). Derivative (V) is then subjected to a Johnson-Remeiux reaction by first treatment with OsO4 and NMO in MeOH/THF/H2O followed by oxidation with NaIO4 in MeOH/THF/H2O to afford aldehyde (VI), which is then reduced by means of NaBH4 in MeOH to furnish alcohol (VII). Reaction between (VII) and morpholine (VIII) in refluxing MeOH affords baccatin III derivative (IX) (1), which is treated with TsOH in MeOH and then with acetic anhydride and DMSO to yield compound (X). Desulfurylation of (X) by refluxing with Raney-Ni in EtOH followed by removal of the TES protecting group by reaction with HF-pyridine affords intermediate (XI), which is finally converted into the desired compound by introduction of the phenylisoserine side-chain using protected beta-lactam (XII) and NaHMDS in THF followed by TBS removal by treatment with HF-pyridine.