Iron(III)-catalyzed Highly Efficient, One-pot Synthesis of Triazolo[1,2-<i>a</i>]indazoletriones and Spirotriazolo[1,2-<i>a</i>]indazoletetraones
作者:B. V. Subba Reddy、N. Umadevi、G. Narasimhulu、J. S. Yadav
DOI:10.1246/cl.130164
日期:2013.8.5
Three-component coupling (3CC) of aldehyde, 1,3-dione, and 4-phenylurazole has been achieved in the presence of 10 mol % anhydrous FeCl3 in acetonitrile under reflux conditions to afford the corresponding triazolo[1,2-a]indazoletriones in excellent yields while the coupling of isatins with 4-phenylurazole and 1,3-diones gave the spirotriazolo[1,2-a]indazoletetraones under similar conditions.
A new, convenient, and high yielding procedure for the synthesis of triazolo[1,2-a]indazole-triones by the condensation reaction between dimedone, aryl aldehydes, and ueazoles in the presence of a catalytic amount of sulfonated polyethylene glycol (PEG-SO3H) as a highly stable and reusable eco-friendly degradable polymeric catalyst is described under solvent-free conditions. This procedure has also
为三唑的合成中的新的,方便,和高产过程[1,2一]吲唑三酮在磺化聚乙二醇的催化量的双甲酮存在下,芳基醛和ueazoles之间的缩合反应(PEG-在无溶剂条件下描述了作为高度稳定且可重复使用的生态友好型可降解聚合物催化剂的SO 3 H)。该方法也已经成功地用于合成新型螺三唑[1,2 - a ]吲唑-四酮。