Efficient Synthetic Access to the Hetisine C<sub>20</sub>-Diterpenoid Alkaloids. A Concise Synthesis of Nominine via Oxidoisoquinolinium-1,3-Dipolar and Dienamine-Diels−Alder Cycloadditions
作者:Kevin M. Peese、David Y. Gin
DOI:10.1021/ja0625430
日期:2006.7.1
A concisesynthetic approach to the hetisine C20-diterpenoid alkaloids is reported. The totalsynthesis of (+/-)-nominine was accomplished in a 15-step sequence employing a dual cycloaddition strategy. Key features of the synthesis include a reversible intramolecular 4-oxidoisoquinolinium betaine dipolar cycloaddition in conjunction with a pyrrolidine-induced dienamine isomerization/Diels-Alder cascade