A Stereoselective Approach to the Azaspiro[5.5]undecane Ring System Using a Conjugate Addition/Dipolar Cycloaddition Cascade: Application to the Total Synthesis of (±)-2,7,8-<i>epi</i>-Perhydrohistrionicotoxin
作者:Michael S. Wilson、Albert Padwa
DOI:10.1021/jo801295e
日期:2008.12.19
Azaspirocycle 25 was transformed into 2,7,8-epi-PHTx (4) in five additional steps. Utilizing this tandem conjugate addition/dipolarcycloaddition cascade, we have also successfully synthesized azaspiro[5.5]undecane 36, which had previously been converted into (+/-)-perhydrohistrionicotoxin (2), thereby completing a formaltotalsynthesis of this alkaloid.