Synthesis of Tetrasubstituted Olefins by Pd-Catalyzed Addition of Arylboronic Acids to Internal Alkynes
作者:Chengxiang Zhou、Richard C. Larock
DOI:10.1021/ol047759q
日期:2005.1.1
[Reaction: see text] Tetrasubstitutedolefins are readily prepared by the Pd-catalyzed cis addition of two aryl groups from an arylboronic acid to opposite ends of the triple bond of internalalkynes. The synthesis proceeds under very mild reaction conditions and tolerates a wide variety of functional groups, including alcohol, aldehyde, ester, TMS, and acetal groups.
Tetrasubstituted Olefin Synthesis via Pd-Catalyzed Addition of Arylboronic Acids to Internal Alkynes Using O<sub>2</sub> as an Oxidant
作者:Chengxiang Zhou、Richard C. Larock
DOI:10.1021/jo060104d
日期:2006.4.1
alkynes provides a convenient route to a wide variety of tetrasubstituted olefins. The reaction is conducted in DMSO using molecular O2 as an oxidant in the absence of any base. The reaction involves the cis addition of two aryl groups from the arylboronic acid to opposite ends of the triple bond of the internal alkyne. The synthesis tolerates a wide variety of functional groups, including alcohol, aldehyde
Efficient Palladium-Catalyzed Double Arylation of Phosphonoalkynes and Diarylalkynes in Water: Use of a Dinuclear Palladium(I) Catalyst
作者:K. V. Sajna、Venu Srinivas、K. C. Kumara Swamy
DOI:10.1002/adsc.201000579
日期:2010.11.22
A novel use of the dinuclearpalladium(I) catalyst [(OCH2CMe2CH2O)P-S-Pd(PPh3)]2 in aqueous medium for the doublearylation of phosphonoalkynes as well as diarylalkynes is reported. This doublearylation requires both the iodoarene and arylboronic acid along with the catalyst. The structures of some key products have been proven by X-ray crystallography.
Some alkynes were diarylated by aryltributylstannane 2 in the presence of palladium salt in moderate to good yield with high stereoselectivity. The reaction was catalytic in palladium using copper(II) chloride dihydrate as a reoxidant.