A facile synthesis of novel ferrocene grafted spiro-indenoquinoxaline pyrrolizidines via one-pot multicomponent [3+2] cycloaddition of azomethine ylides
作者:A.R. Suresh Babu、D. Gavaskar、R. Raghunathan
DOI:10.1016/j.tetlet.2012.09.104
日期:2012.12
A facile one-potsynthesis of novel ferrocene grafted spiro-indenoquinoxaline pyrrolizidines via multicomponent-[3+2]-cycloaddition of azomethineylides is described. The methodology is very simple and applicable to a wide variety of ferrocene derived dipolarophiles. The structures of cycloadducts were confirmed by spectroscopic analysis. X-ray analysis of one of the analogs, adds conclusive support
[Display omitted] An interesting product divergence in the reaction of trifluorodiazoethane with arylidene-1,3-indanediones is reported. The reaction conducted using 10 mol% of silver carbonate afforded trifluoromethylspiropyrazolines, while with excess of cesium fluoride in methanol, the cycloaddition was followed by nucleophilic ringopening of the spiropyrazoline to afford trifluoromethylated -ca