Rhodium-catalyzed Synthesis of Indenols by Regioselective Coupling of Alkynes with Ortho-carbonylated Arylboronic Acids
作者:Ryo Shintani、Kazuhiro Okamoto、Tamio Hayashi
DOI:10.1246/cl.2005.1294
日期:2005.9
A rhodium/diene-catalyzed regioselective synthesis of indenols has been developed through the coupling of alkynes with ortho-carbonylated arylboronic acids. These reactions proceed under mild conditions in uniformly high yield and regioselectivity. The reaction has also been applied to its asymmetric variant by the use of chiral diene ligands to achieve high enantioselectivity.
bearing 2,9-diaryl-1,10-phenanthroline ligands exhibit not only unprecedented catalytic activity but also unusual ligand-controlled divergent regioselectivity in hydrosilylation reactions of various alkynes. The hydrosilylation protocol described herein provides a highly efficient method for preparing useful di- and trisubstituted olefins on a relatively large scale under mild conditions, and its use
Rhodium-Catalyzed Hydroalkynylation of Internal Alkynes with Silylacetylenes: An Alkynylrhodium(I) Intermediate Generated from the Hydroxorhodium(I) Complex [Rh(OH)(binap)]2
A highly selective hydroalkynylation of internalalkynes with silylacetylenes giving 1,3-enynes was realized by use of a hydroxorhodium catalyst. As a key intermediate in the catalytic cycle, an alkynylrhodium(I) complex was isolated and investigated for its structure and reactivity.
Cobalt‐Catalyzed Intermolecular [2+2] Cycloaddition between Alkynes and Allenes
作者:Wei Ding、Naohiko Yoshikai
DOI:10.1002/anie.201813283
日期:2019.2.18
An intermolecular [2+2] cycloaddition reaction between an alkyne and an allene is reported. In the presence of a cobalt(I)/diphosphine catalyst, a near equimolar mixture of the alkyne and allene is converted into a 3‐alkylidenecyclobutene derivative in good yield with high regioselectivity. The reaction tolerates a variety of internal alkynes and mono‐ or disubstituted allenes bearing various functional