作者:Zhan Mao、Steven W. Baldwin
DOI:10.1021/ol0491888
日期:2004.7.1
see text] A new method for preparing spirocyclic oxindoles is presented. Featuring a [3,3]-sigmatropic enolate rearrangement, the three-step process converts carboxylic acid starting materials to oxidnole products in overall yields of 52-76%. The enolate rearrangement step occurs at -78 degrees C and provides easy access to oxindole products that have previously been difficult to prepare.
[反应:见正文]提出了一种新的制备螺环羟吲哚的方法。具有[3,3]-σ烯醇酸酯重排的特征,该三步法将羧酸原料转化为氧化烯产物,总产率为52-76%。烯醇化物重排步骤在-78摄氏度下进行,可轻松获得以前难以制备的羟吲哚产物。