Nucleophilic C-vinylation or C-allylation of aldehydes and ketones followed by O-allylation of the obtained carbinols gave the corresponding allyl ethers. Ring-closing metathesis of the latter afforded cyclic ethers (dihydrofurans and dihydropyrans, respectively) which were then subjected to allylic oxidation to yield conjugated γ- and δ-lactones.
通过对醛和酮进行亲核碳
乙烯基化或碳烯丙基化反应,随后对所得卡宾醇进行氧烯丙基化,得到了相应的
烯丙醚。后者经过环闭合易位反应,分别得到
环醚(二氢
呋喃和二氢
吡喃),再经过烯丙位的氧化反应,分别生成共轭的γ-和δ-内酯。