Rapid and efficient desilylation and deuteration of alkynylpyridines
摘要:
We describe a rapid and efficient technique for the direct installation of deuterium atoms following the removal of trimethylsilyl groups from alkynylpyridines. Utilizing tetrabutylammonium fluoride in the presence of deuterium oxide, we observe up to 97% deuterium incorporation in as little as one minute of reaction time. (C) 2015 Elsevier Ltd. All rights reserved.
The reaction of [Cp*MX2](2) (M = Rh or Ir, X = Cl, Br, or I) with alkynylpyridines afforded halogen-substituted N-metallacyclic complexes. The reaction pathway has been examined through deuterium labeling and other experiments and computational studies and is proposed to proceed via halide dissociation followed by attack at the alkyne. These N-metallacycles exhibit aromaticity and undergo Sonogashira coupling reactions.