Phosphine-mediated annulation of N-protected imines with DEAD
摘要:
In the presence of triphenylphosphine, the reactions of N-protected imines or their precursors with DEAD proceeded smoothly to give the corresponding functionalized 1H-1,2,4-triazole-1,4(5H)-di-carboxylate derivatives in good to high yields under mild conditions. A plausible mechanism has been proposed on the basis of the control experiments. (C) 2011 Elsevier Ltd. All rights reserved.
Friedel-Crafts reaction of indoles with alpha-amido sulfones in the presence of montmorillonite K-10 leads unexpectedly to 3-(1-arylsulfonylalkyl) indoles in good yield. The obtained products can be further desulfonylated under reductive or alkylative conditions giving linear and branched 3-substituted indoles.