combination of cationic rhodium(I) complexes with N-phosphino tert-butylsulfinamides (PNSO) ligands is efficient for catalytic intra- and intermolecular [2+2+2] cycloaddition reactions. PNSO ligands are a new class of chiral bidentate ligands, which have the characteristic of combining the easily accessible sulfur chirality with the coordinating capacity of phosphorous. Cycloaddition of open-chained and
A Pd‐Au alloy efficiently catalyzed the [2+2+2] cycloaddition of substituted alkynes. Whereas monometallic Pd and Au catalysts were totally ineffective, Pd‐Au alloy nanoparticle catalysts with a low Pd/Au molar ratio showed high activity to give the corresponding polysubstituted arenes in high yields. A variety of substituted alkynes participated in various modes of cycloaddition under Pd‐Au alloy
Rhodium-catalyzed selective [2+2+2] cyclizations of 1,6-diynes with monoynes leading to isoindolines and isobenzofurans
作者:Wei Wu、Xiao Yun Zhang、Shou Xing Kang
DOI:10.1016/j.cclet.2009.08.004
日期:2010.1
A highly efficient and selective [2 + 2 + 2] cyclization of diynes and monoalkynes was catalyzed by rhodium under room temperature in water/THF mixed solvent, affording isoindolines and isobenzofurans in good to excellent yields. The center atoms (N, O) in the diynes showed a significant effect for the cyclization. (C) 2009 Wei Wu. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.
Grigg, Ronald; Scott, Ronald; Stevenson, Paul, Journal of the Chemical Society. Perkin transactions I, 1988, p. 1357 - 1364
作者:Grigg, Ronald、Scott, Ronald、Stevenson, Paul
DOI:——
日期:——
Substituted benzocyclobutenes, indans, and tetralins via cobalt-catalyzed cooligomerization of .alpha.,.omega.-diynes with substituted acetylenes. Formation and synthetic utility of trimethylsilylated benzocycloalkenes