reactions of dibromoalkenes with arylboronic acids using a hydrazone–Cu catalyst system proceeded smoothly under mild conditions to afford the corresponding internal alkyne derivatives in good yields. Furthermore, we also succeeded in the synthesis of o-allyloxy(ethynyl)benzene derivatives, which are known to be effective precursors of various heterocyclic compounds, through this reaction.
Cross-coupling reactivity of 1,1-dichloroalkenes under palladium catalysis: domino synthesis of diarylalkynes
作者:L. N. Rao Maddali、Suresh Meka
DOI:10.1039/c7nj05107g
日期:——
An efficientsynthesis of diarylalkynes was achieved from the domino cross-coupling reaction of 1,1-dichloroalkenes with triarylbismuth reagents under palladium-catalyzed conditions. Under the established palladium protocol, 1,1-dichloroalkenes demonstrated hitherto unknown remarkable cross-coupling reactivity with organometallic triarylbismuth reagents to furnish functionalized diarylalkynes.
作者:Jincheng Mao、Guanlei Xie、Minyan Wu、Jun Guo、Shunjun Ji
DOI:10.1002/adsc.200800517
日期:2008.11.3
Ligand-freeiron/coppercocatalyzed cross-coupling reactions of aryl halides with terminal alkynes were carried out to provide the corresponding coupling products in good yields (up to 99%). Noteworthy is that this low-cost, effective and environmentally friendly protocol was the first to be employed in alkynylationcouplings.
Samarium Powder-Catalyzed Palladium-Free and Ligand-Free Sonogashira Coupling Reactions
作者:Jincheng Mao、Minyan Wu、Guanlei Xie、Shunjun Ji
DOI:10.1002/adsc.200900258
日期:2009.9
A study of samarium powder-catalyzed cross-coupling reactions of aryl halides with terminal alkynes is described. The couplings performed in the polyethylene glycol PEG-600 provided the corresponding coupling products in good yields. The first example of palladium-free, copper-free and amine-free catalytic system for Sonogashira couplings is presented in the absence of ligand.
External oxidant-free cross-coupling of arylcopper and alkynylcopper reagents leading to arylalkyne
作者:Sheng Wang、Yaosen Min、Xiaowei Zhang、Chanjuan Xi
DOI:10.1039/c7ra03348f
日期:——
External oxidant-free oxidative cross-coupling between arylcopper and alkynylcopper has been performed, which provides a new way for the formation of arylalkyne with high selectivity.