Asymmetric Synthetic Access to the Hetisine Alkaloids: Total Synthesis of (+)-Nominine
作者:Kevin M. Peese、David Y. Gin
DOI:10.1002/chem.200701290
日期:2008.2.8
A dual cycloaddition strategy for the synthesis of the hetisinealkaloids has been developed, illustrated by a concise asymmetric total synthesis of (+)-nominine (7). The approach relies on an early-stage intramolecular 1,3-dipolar cycloaddition of a 4-oxido-isoquinolinium betaine dipole with an ene-nitrile dipolarophile. Subsequent late-stage pyrrolidine-induced dienamine isomerization/Diels-Alder
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