Syntheses of Strychnos and Aspidospermatan-Type Alkaloids. 8. Selective Total Syntheses of Mossambine and 14-<i>epi</i>-Mossambine by a Radical Cyclization Reaction<sup>1</sup>
作者:Martin E. Kuehne、Tiansheng Wang、Denis Seraphin
DOI:10.1021/jo961023s
日期:1996.1.1
Mossambine (6) was obtained by a six-step reaction sequence from the indoloazepine ester 7. Radicalcyclization of the tetracyclic vinyl iodide 12a provided a racemic pentacyclic ketone 16E, which could be converted to either enantiomer by condensation with (S or R)-N,S-dimethyl-S-phenylsulfoximine and selective pyrolysis of the resulting diastereomeric alcohols 18 and 19 or 20 and 21. Selective reductions