The intramolecular enyne diels-alder reaction. Stereoselective construction of tricyclic dioxadienones and mechanistic outline
摘要:
4-Methylpent-4-en-2-yn-1-ols and 6-hydroxy-2,3-dihydro-6H pyran 3-ones are condensed in different ways to a series of tricyclic dioxadienones which contain the basic framework of the cadlinolides. A mechanism of the intramolecular enyne-ene cycloisomerization and the origin of the resulting type I and type II dienes is proposed.
Synthesis of benzofurans via an acid catalysed transacetalisation/Fries-type O → C rearrangement/Michael addition/ring-opening aromatisation cascade of β-pyrones
作者:Siddheshwar K. Bankar、Jopaul Mathew、S. S. V. Ramasastry
DOI:10.1039/c6cc01016d
日期:——
An unusual and facile approach for the synthesis of 2-benzofuranyl-3-hydroxyacetones from 6-acetoxy-[small beta]-pyrones and phenols is presented.