ja3014105_si_001.pdf (6.95 MB)
Alkyne and Reversible Nitrile Activation: N,N′-Diamidocarbene-Facilitated Synthesis of Cyclopropenes, Cyclopropenones, and Azirines
journal contribution
posted on 2012-04-11, 00:00 authored by Jonathan
P. Moerdyk, Christopher W. BielawskiWe report the synthesis of a variety of diamidocyclopropenes
by
combining an isolable and readily accessible N,N′-diamidocarbene (DAC) with a range of alkynes (nine
examples, 68–97% yield). Subsequent hydrolysis of selected
cyclopropenes afforded the corresponding cyclopropenones or α,β-unsaturated
acids, depending on the reaction conditions. In addition, the combination
of a DAC with alkyl or aryl nitriles was found to form 2H-azirines in a reversible manner (four examples, Keq = 4–72 M–1 at 30 °C in
toluene).