An efficient regioselective C-3 acylation of free indoles (N-H) has been accomplished via oxidative decarbethoxylation of easily available ethyl arylacetates using Cu(OAc)2 and KOtBu in DMSO.
Temperature-Dependent Product Selectivity in the VilsmeierHaack Reaction on Bis(phenylhydrazones) of Bis(aroylmethyl) Sulfides (=1,1′-[Thiobis(methylene)]bis[arylmethanone] Bis(2-phenylhydrazones)): Synthesis of 3-Aroylindoles (=Aryl(1H-indol-3-yl)methan
作者:Nidhin Paul、Shanmugam Muthusubramanian
DOI:10.1002/hlca.201200198
日期:2013.3
The bis(phenylhydrazone) of substituted diphenacyl sulfides (=1,1′‐[thiobis(methylene)]bis[arylmethanone] bis(2‐phenylhydrazones)) 1 underwent a tandem sequence of reactions upon treatment with Vilsmeier reagent, ultimately yielding 3‐aroylindoles (=aryl(1H‐indol‐3‐yl)methanones) 3 (Scheme 1 and Table 1). The reaction seems to be productselective depending upon the reaction temperature.