DABCO Promoted Regioselective Synthesis of New Diversely Functionalized 3-Hydroxy-2-Oxindole Scaffolds
作者:Pramod B. Thakur、Jagdeesh B. Nanubolu、Harshadas M. Meshram
DOI:10.1071/ch13580
日期:——
γ-addition of β-keto sulfones on isatins has been achieved in the presence of a catalytic amount of 1,4-diazabicyclo[2.2.2]octane (DABCO) to afford a γ-(3-hydroxy-2-oxindole)-β-keto sulfone structural framework. The scope of the method is tested by screening a series of isatin electrophiles as well as β-keto sulfones. The described method was found to be very handy and provides straightforward access for the
在催化量的1,4-二氮杂双环[2.2.2]辛烷(DABCO)存在下,可获得高效且高度区域选择性的β-酮砜在靛红上的γ加成反应,得到γ-(3-羟基- (2-氧吲哚)-β-酮砜的结构框架。该方法的范围通过筛选一系列伊斯汀亲电试剂以及β-酮砜来测试。发现所描述的方法非常方便,并且在无金属的反应条件下从容易获得的起始原料以非常好的收率提供了多种功能化的3-β-酮砜取代的-3-羟基-2-氧吲哚结构支架的直接途径。