Selective Thiylation of 1-Vinylpyrrole-2-carbaldehydes: Synthesis of the Novel Pyrrole Synthons 2-[Bis(ethylsulfanyl)methyl]-1-vinylpyrroles and 1-(2-Ethylthioethyl)pyrrole-2-carbaldehydes
作者:Boris Trofimov、Alexander Vasil’tsov、Andrey Ivanov、Igor’ Ushakov、Al’bina Mikhaleva
DOI:10.1055/s-2006-958975
日期:2007.2
at the N-vinyl group (free-radical initiation) to afford 1 -vinylpyr-role-2-carbaldehyde thioacetals (88-99% yield) or 1-(2-ethylthio-ethyl)pyrrole-2-carbaldehydes (68-89% yield), respectively. Both derivatives constitute important new families of pyrrole building blocks. Exhaustive thiylation at both the aldehyde and vinyl functionalities was achieved by acid-catalyzed reaction of the ethylthioethyl
1-Vinylpyrrole-2-carbaldehydes 在醛(酸催化)或 N-乙烯基(自由基引发)处被乙硫醇选择性硫醇化,得到 1-vinylpyr-role-2-carbaldehyde thioacetals (88-99 % 产率)或 1-(2-乙硫基-乙基)吡咯-2-甲醛(产率 68-89%)。这两种衍生物构成了重要的新型吡咯结构单元家族。通过吡咯-2-甲醛的乙基硫乙基衍生物与乙硫醇的酸催化反应,实现了醛和乙烯基官能团的完全硫醇化。还观察到并讨论了乙硫醇意外还原乙硫缩醛基团以在自由基引发下得到乙硫基甲基基团。