Starting from D-mannitol, the total syntheses of methyl 9(S)- and 9(R)-hydroxy 5(Z), 7(E), 11(Z) eicosatetraenoate are described by two different ways. One route uses a diepoxide opening by an acetylide while the second one involved the transformation of a diepoxide into an equivalent of malic aldehyde, an important intermediate in the synthesis of other oxidation products of arachidonic acid. Both methods
Efficient route to optically pure polyfunctionalized cyclooctanes
作者:Christine Gravier-Pelletier、Olivia Andriuzzi、Yves Le Merrer
DOI:10.1016/s0040-4039(01)02126-8
日期:2002.1
efficient synthesis of enantiopure highly functionalized eight-membered carbocyclicrings is described from 1,2:5,6-bis-epoxides issued from d-mannitol. The key cyclization step involves the metathesis of 1,9-diene using Grubbs’ catalyst or the pinacolic coupling of 1,8-dialdehyde resulting from the oxidative cleavage of the previous diene. In the specific case of ring-closing metathesis cyclization, the