Catalytic [3+3] Annulation of
<scp>β‐Ketoethers</scp>
and Cyclopropenones
<i>via</i>
C(sp
<sup>3</sup>
)—O/C—C Bond Cleavage under
<scp>Transition‐Metal</scp>
Free Conditions
carbon-oxygen (C—O) bond is highly important for the transformation of oxygen-rich biomass and industry chemicals. Herein, an efficient [3+3] annulation of β-ketoethers with cyclopropenones in the presence of catalytic base has been developed, which proceeds through the C(sp3)—O bonds cleavage in β-ketoethers and C—C bond cleavage in cyclopropenones under transition-metal free conditions. The cleavage of C(sp3)—O
A phosphine-catalyzed ring-opening additionreaction of cyclopropenones with a variety of nucleophiles (NuH), including oxygen-, nitrogen-, sulfur-, and carbon-based ones, has been investigated, which produces potentially useful α,β-unsaturated carbonyl derivatives in high yields (up to 99%), high regioselectivity, and exclusive E-selectivity. The reaction proceeds in high efficiency under very mild
The palladium-catalyzed hydrophenoxycarbonylation of internal alkynes by phenol and carbon monoxide was successfully realized by Pd(OAc)(2)/dppp catalyst system in the co-presence of Zn dust. (C) 2010 Elsevier Ltd. All rights reserved.
Kohler, Heritage, American Chemical Journal, 1905, vol. 34, p. 574
作者:Kohler, Heritage
DOI:——
日期:——
Nicolaus, Annali di Chimica Applicata, 1949, vol. 39, p. 542