A total synthesis of the sesquiterpene quinone metachromin-A
作者:Wanda P. Almeida、Carlos Roque D. Correia
DOI:10.1016/s0040-4039(00)76220-4
日期:1994.2
The first totalsynthesis of the marine natural product metachromin A was accomplished through a convergent synthesis amenable to the preparation of synthetic analogues. The main features of this synthesis are the introduction of the oxygenation at C17 employing a Thiele acetoxylation reaction and a stereoselective Horner-Wadsworth-Emmons coupling of a nonstabilized phosphonate with a methyl ketone
Six newsesquiterpenoid quinones with an amino acid residue, metachromins L–Q (1–6), have been isolated from an Okinawanmarinesponge Spongia sp. The structures and stereochemistry of 1–6 were elucidated on the basis of the spectroscopic data and chemical correlations. Metachromins L (1) and M (2) showed modest cytotoxicity.