Synthesis and absolute configurations of the naturally occurring 3- and 4-methylmuconolactones: X-ray structures of (S)-1-phenylethylammonium salts and an 8-bromo-1-methyl-muconodilactone
作者:Andrew A. Freer、Gordon W. Kirby、Ghanakota V. Rao、Ronald B. Cain
DOI:10.1039/p19960002111
日期:——
(±)-3-Methylmuconolactone (±)-4 is resolved by fractional crystallisation of the (S)-(–)-1-phenylethylammoniumsalts. The X-raycrystalstructures of both salts are determined. Salt A (Fig. 1) gives (S)-(–)-3-methylmuconolactone 4, which is identical to the lactone from fungi. The lactone is converted with bromine into the bromo dilactone 5 and thence with tributyltin hydride into the (–)-1-methylmuconodilactone