Alkyne Phosphonites for Sequential AzideAzide Couplings
M.R.J. Vallée, L.M. Artner, J. Dernedde, C.P.R. Hackenberger – 2013
When Staudinger meets Huisgen! A combination of the copper-catalyzed variant of the Huisgen azide–alkyne cycloaddition (CuAAC) and the Staudinger reaction, the two most successful chemoselective reactions for the transformation of azides, leads to a chemical method that allows the sequential coupling of two different azido building blocks in high yields. This modular procedure enables a final metal-free conjugation of functional building blocks to azides.