SYNTHESIS OF NEO-tANSHINLACTONE VIA THE PALLADIUM-MEDIATED INTRAMOLECULAR BIARYL COUPLING REACTION
摘要:
Neo-tanshinlactone (1) was synthesized by the intramolecular aryl-aryl coupling reaction of the precursor ester, which was prepared from the corresponding furan carboxylic acid (13) and naphthol (3), using a palladium reagent.
A simple two-step synthesis of 4-methoxycarbonyl-2(5H)-furanone consisting of formylation of dimethyl 2-(bromomethyl) fumarate, followed by acid catalysed transesterification in methanol was carried out. It led to the corresponding substituted furanone in 67% global yield.
The Diels-Alder reaction of some bromo derivatives of the itaconic acid with cyclopenta-1,3-diene gave a simple access to precursors of spherical polyols of synthetic interest. bicyclic compounds - Diels-Alder reaction - ozonolysis - stereoselective synthesis - protecting groups