Natural benzofurans. Synthesis of eupomatenoids-1, -3, -4, -5, -6, -7, and -13
Abstract
A group of eupomatenoids, natural lignans possessing 2-aryl-3-methyl-5-propenylbenzofuran structures. have been synthesized by short pathways which include the intramolecular Wittig reaction of an o-bromoethylaryl benzoate ester as a key step.