The intermolecular deacylative coupling of unstrained ynones via C-C bond activation was accomplished by a CuCl-bpy system undermild reaction conditions. This protocol features facile cleavage of the C-C bond at room temperature, broad substrate scope, and efficient construction of important symmetric and unsymmetrical 1,3-diyne adducts through homo or cross coupling of ynones, respectively. The preliminary
Cobalt‐Catalyzed Temperature‐Dependent Annulation of 3‐Aryl‐1,2,4‐oxadiazolones with 1,3‐Diynes: An Approach to π‐Conjugated Molecules
作者:Wenge Zhang、Hongji Li、Lei Wang
DOI:10.1002/adsc.201801165
日期:2019.6.18
A Cobalt‐catalyzedannulation of 3‐aryl‐1,2,4‐oxadiazolones with 1,3‐diynes has been developed, in which reaction temperature variation considerably affects the cyclization orientation and afforded structurely distinctive products in good yields and high regioselectivity. Additionally, the late‐stage transformation of the cyclization products into N‐containing heterocycles is also demonstrated.
The Co(II)-catalyzed selective C–H alkenylation of picolinamides with 1,3-diynes has been developed. This protocol can be applied to a variety of 1,3-diynes. In addition, both symmetrical and unsymmetrical internal alkynes were well tolerated, affording the corresponding alkenyl arenes. Moreover, control experiments indicated that C–H bond cleavage may be involved in the rate-determining step. Furthermore
We developed a technique mediated by visible light for the aerobic homocoupling of terminal alkynes to synthesize 1,3-conjugated diynes using a copper(I) chloride catalyst at room temperature. Compared with previously reported thermal processes, this photochemical method is simple, uses only mild reaction conditions, produces high yields and works well for substrates with electron-withdrawing groups
Practical Oxidative Homo- and Heterocoupling of Terminal Alkynes Catalyzed by Immobilized Copper in MCM-41
作者:Ruian Xiao、Ruiya Yao、Mingzhong Cai
DOI:10.1002/ejoc.201200359
日期:2012.8
A practicaloxidativehomo- and heterocoupling of terminalalkynes was achieved in CH2Cl2 at 25 °C by using a 3-(2-aminoethylamino)propyl-functionalized MCM-41-immobilized copper(I) complex (MCM-41–2N-CuI, 1 mol-%) as the catalyst, piperidine (0.1 or 3 equiv.) as the base, and air as the environmentally friendly co-oxidant, yielding a variety of symmetrical and unsymmetrical 1,4-disubstituted 1,3-diynes