Reactivity of highly Lewis acidic diborane(4) towards pyridine and isocyanide: formation of boraalkene-pyridine complex and ortho-functionalized pyridine derivatives.

ABSTRACT: The reaction of pinB-BMes₂ (pin = pinacolato, Mes = 2,4,6-Me₃C₆H₂) with Xyl-NC (Xyl = 2,6-Me₂C₆H₃) and pyridine results in the formation of a pyridine-coordinated boraalkene that exhibits an intense color caused by an intramolecular charge-transfer interaction. In the presence of an excess of pyridine, the ortho C-H bond of pyridine was selectively functionalized to afford a quinoid compound or an isocyanide-coupled product. Based on the concentration effect, the reaction stoichiometry, and previously reported DFT calculations, a reaction mechanism that involves several rearrangement reactions was proposed. Using the present method, substituted pyridines and N-heterocycles afforded the corresponding functio

SUBMITTER: Katsuma Y 

PROVIDER: S-EPMC5887101 | biostudies-literature | 2018 Feb

REPOSITORIES: biostudies-literature