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
摘要:
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)。
Pyrrolidino(or isoindolo)[1,3]benzothiazines 1a,b were efficiently synthesized in a four-step sequence from the known o-(benzylthio) benzyl alcohol 2. The key step was the nucleophilic attack of the sulfur atom onto N-acyliminium ion 6 which was generated in high acidic medium from omega-carbinol lactam 5. The last was regioselectively obtained by reduction of the parent imide 4. (C) 1994 Elsevier Science Ltd. All rights reserved.
New Amine Trithiolate Tripod Ligand and Its Iron(II) and Iron(III) Complexes
作者:Nandakumar Govindaswamy、Duncan A. Quarless、Stephen A. Koch
DOI:10.1021/ja00137a024
日期:1995.8
ARYLSULFANYL AND HETEROARYLSULFANYL DERIVATIVES FOR TREATING PAIN