Domino Ring-Closing Metathesis/Intramolecular Transfer of an Alkenyl Subunit: A Direct Formation of Functionalized Butenolides and Pyrones from α,β- and β,γ-Unsaturated Esters
作者:Olivier Piva、Marie-Alice Virolleaud
DOI:10.1055/s-2004-831329
日期:——
A direct synthesis of butenolides and β,γ-unsaturated δ-lactones has been devised by combining a ring-closing metathesis (RCM) with a cross-coupling metathesis (CM) process. The first step of the reaction generates a new carbene group, which is able to functionalize the lateral unsaturated chain during the second coupling reaction. In this way, the transfer of the alkyl group R, initially fixed on the acid chain, avoids the use of an alkene partner introduced in large excess.
通过将闭环偏合成(RCM)与交叉偶联偏合成(CM)工艺相结合,设计出了一种丁烯内酯和δ,δ-不饱和δ-内酯的直接合成方法。反应的第一步产生了一个新的碳烯基,在第二步偶联反应中,该碳烯基能够使侧向不饱和链官能化。这样,最初固定在酸链上的烷基 R 的转移就避免了使用大量过量引入的烯伴侣。