Ring-Opening Reaction of Vinylidenecyclopropanediesters Catalyzed by Re2(CO)10 or Yb(OTf)3
作者:Lei Wu、Min Shi
DOI:10.1002/ejoc.201001398
日期:2011.2
Re2(CO)10 or Yb(OTf)3 afforded 2H-pyran-2-one derivatives or α,β-unsaturated ketones in moderate to good yields through a highly regioselectivecarbon–carbonbondcleavage pathway. The substituents at the cyclopropane mainly determine the regioselectivity of the carbon–carbonbondcleavage, providing different products of tandem ring-opening and rearrangement reactions.
Cu-catalyzed C–C bond formation of vinylidene cyclopropanes with carbon nucleophiles
作者:Jichao Chen、Shang Gao、Ming Chen
DOI:10.1039/c9sc04122b
日期:——
The development of Cu-catalyzed addition of carbon nucleophiles to vinylidene cyclopropanes was reported. The reactions with 1,1-bisborylmethane provided homopropargylic boronate products by forming a C–C bond at the terminal carbon atom of the allene moiety of vinylidene cyclopropanes. Alkynyl boronates are also suitable nucleophile precursors in reactions with vinylidene cyclopropanes, and skipped
An “Anti-Baldwin” 3-<i>Exo-Dig</i> Cyclization: Preparation of Vinylidene Cyclopropanes from Electron-Poor Alkenes
作者:Matthew J. Campbell、Patrick D. Pohlhaus、Geanna Min、Kohsuke Ohmatsu、Jeffrey S. Johnson
DOI:10.1021/ja803553a
日期:2008.7.1
Stabilized carbanions undergo an uncommon 3-exodig cyclization onto propargyl halides through an S(N)2' substitution. Propargyl iodides as electrophiles are necessary to achieve good yields (36-95%) for most substrates, although the usefulness of chlorides and bromides is documented. A variety of monocyclic and bicyclic; vinylidene cycloproparies can be prepared. These products are not available by standard carbene methodology.