Acid-catalysed formation of tricyclic N,S-acetals in imidazolinone series based on the use of the unprecedented N-acyliminium ion cascade reaction involving transposition, heterocyclisation and π-cyclisation
作者:Anthony Pesquet、Adam Daïch、Bernard Decroix、Luc Van Hijfte
DOI:10.1039/b508214e
日期:——
4-Hydroxy-5,5-dimethylimidazolines tethered at N-1 to an aryl sulfide undergo an unprecedented acid-catalysed domino reaction, involving double methyl transposition, heterocyclisation, isomerisation of thiazetidinium ion and, finally, Ï-cyclisation. In this way a one-pot synthesis of original tricyclic N,S-acetals was developed. The same triheterocyclic products can be prepared also starting from the corresponding 5-hydroxy isomers (in this case the cascade of reactions does not involve methyl transposition).
4-Hydroxy-5,5-dimethylimidazolines tethered at N-1 to an aryl sulfide 经历了前所未有的酸催化多米诺反应,包括双甲基转位、杂环化、噻嗪离子异构化以及最后的Ï-环化。通过这种方法,开发出了一种单锅合成原始三环 N、S-乙醛的方法。同样的三环产品也可以从相应的 5-羟基异构体开始制备(在这种情况下,级联反应不涉及甲基转位)。