Active thionium species mediated functionalization at the 2α-position of indole derivatives
作者:Kazuhiro Higuchi、Masanori Tayu、Tomomi Kawasaki
DOI:10.1039/c1cc11645b
日期:——
A combination of dimethyl sulfoxide (DMSO) and trifluoroacetic anhydride (TFAA) mediates functionalization at the 2α-position of indole derivatives. Carbon and heteroatom nucleophiles were directly introduced via a one-pot procedure in excellent yields.
The one-pot 2 alpha- and 3 alpha-functionalization of 2,3-disubstituted indoles using a hypervalent iodine reagent has been developed. The substitution at the 2 alpha-position of indoles took place using phenyliodinebis(trifluoroacetate) with oxygen and carbon nucleophiles in moderate yields. The combination of iodosobenzene and trimethylsilyl azide afforded 3 alpha-azide derivatives preferentially. The latter reaction was applied to other 2,3-disubstituted indoles.