Synthesis of conjugated γ- and δ-lactones from aldehydes and ketones via a vinylation(allylation)-ring closing metathesis–oxidation sequence
作者:J.Alberto Marco、Miguel Carda、Santiago Rodrı́guez、Encarnación Castillo、Marı́a N. Kneeteman
DOI:10.1016/s0040-4020(03)00584-2
日期:2003.6
aldehydes and ketones followed by O-allylation of the obtained carbinols gave the corresponding allyl or homoallyl ethers, respectively. Ring-closing metathesis of these compounds afforded in many cases cyclic ethers (dihydrofurans and dihydropyrans, respectively) bearing disubstituted and trisubstituted CC bonds. These were then subjected to allylic oxidation to yield conjugated γ- and δ-lactones. Reasons
醛和酮的亲核C-乙烯基化和C-烯丙基化,然后将得到的甲醇进行O-烯丙基化,分别得到相应的烯丙基或高烯丙基醚。这些化合物的闭环易位在许多情况下提供带有二取代和三取代的CC键的环状醚(分别为二氢呋喃和二氢吡喃)。然后将它们进行烯丙基氧化以产生共轭的γ-和δ-内酯。介绍并讨论了观察到的故障的原因。