Synthesis of Seven-Membered Cross-Conjugated Cyclic Trienes by 8π Electrocyclic Reaction
作者:Ranmaru Kato、Hiroki Saito、Shoko Uda、Daisuke Domon、Kazutada Ikeuchi、Takahiro Suzuki、Keiji Tanino
DOI:10.1021/acs.orglett.1c03383
日期:2021.11.19
A method for the synthesis of 3-methylene-1,4-cycloheptadiene derivatives via an 8π electrocyclization reaction was developed. The triene substrate bearing a phosphate or carbamate group was prepared from γ,δ-unsaturated esters and α,β-unsaturated aldehydes in four steps. Upon treatment with NaHMDS or KHMDS, the substrate formed a heptatrienyl anion, which underwent electrocyclization and subsequent
开发了一种通过8π电环化反应合成3-亚甲基-1,4-环庚二烯衍生物的方法。由γ,δ-不饱和酯和α,β-不饱和醛分四步制备带有磷酸或氨基甲酸酯基团的三烯底物。在用 NaHMDS 或 KHMDS 处理后,底物形成了一个庚三烯基阴离子,它经历了电环化和随后的离去基团的 β-消除。该产物可以分两步转化为鎓盐。