Asymmetric synthesis of 1,2-dioxanes: approaches to the peroxyplakoric acids
作者:Chunping Xu、Chris Schwartz、Joseph Raible、Patrick H. Dussault
DOI:10.1016/j.tet.2009.09.068
日期:2009.11
The stereospecific intramolecular alkylation of a hydroperoxyacetal provides the basis for the first asymmetric synthesis of the dioxane propionate core of the peroxyplakorates. Chemoselective hydrometallation of an alkyne in the presence of a peroxide is used to introduce a synthon for the polyunsaturated side chains of the peroxyplakorates. The route suggests a general solution for the 1,2-dioxane unit in many peroxide natural products. (C) 2009 Elsevier Ltd. All rights reserved.
Antifungal Peroxyketal Acids from an Okinawan Marine Sponge of Plakortis sp.
acids and their methyl esters, the peroxyplakoric acids A1 methyl ester (1), A2 methyl ester (2), A3 methyl ester (3), B1 methyl ester (4), and B3 methyl ester (5), were separated from an Okinawanmarinesponge of Plakortissp. The absolute stereostructures 1-5 have been elucidated on the basis of chemical and physicochemical evidence.