合成路线1

11) Hassner and Belostotskii reported a simple synthesis of 7-alkyl-7-azabicyclo[2.2.1]heptanes. The starting aminoalcohols which were easily available from the monoethylene ketal of 1,4-cyclohexanedione (XLI) were treated with triphenylphosphine-carbon tetrachloride, leading to 7-alkyl-7-azabicyclo[2.2.1]heptanes (XLIII) in good yields. Recently, Davis et al. described the microbial hydroxylations of (XLIII) using the fungi Beauveria bassiana, Rhizopus nigricans, Aspergillus ochraceus and Rhizopus arrhizus as the primary organisms. Though the enantioselectivity was not high enough, these results demonstrated the potential of microbiological oxygenations to deliver enantioselective reactions.