An efficient approach to the azaspirocyclic structure of halichlorine and pinnaic acid
作者:Sangku Lee、Zuchun (Spring) Zhao
DOI:10.1016/s0040-4039(99)01578-6
日期:1999.11
Two new classes of alkaloids, halichlorine and pinnaicacid, were isolated from marine organisms. A tandem cycloaddition and isomerization have accomplished a short and general synthesis of the azaspirocyclic core structure of halichlorine and pinnaicacid.
Combining two-directional synthesis and tandem reactions. Part 4: A concise approach to the spirocyclic core of halichlorine and the pinnaic acids
作者:Louise G. Arini、Peter Szeto、David L. Hughes、Robert A. Stockman
DOI:10.1016/j.tetlet.2004.09.058
日期:2004.11
A synthesis of the spirocyclic core structure of halichlorine, an inhibitor of the induced expression of VCAM-1 and the pinnaicacids, inhibitors of PLA2, is presented. A two-directional strategy is employed, in conjunction with a tandem oxime formation/Michael addition/cycloaddition to form the key azaspirocyclic skeleton in a very direct manner.