Multicomponent Reactions of Phosphines, Diynedioates, and Aryl Aldehydes Generated Furans Appending Reactive Phosphorus Ylides through Cumulated Trienoates as Key Intermediates: A Phosphine α-Addition-δ-Evolvement of an Anion Pathway
作者:Jie-Cheng Deng、Shih-Ching Chuang
DOI:10.1021/ol502879c
日期:2014.11.7
Multicomponent reactions of phosphines, diynedioates, and aryl aldehydes have been demonstrated, providing trisubstituted furans appending reactive phosphorus ylides, through cumulated trienoates as key intermediates. The proposed trienoate intermediates, 1,5-dipolar species formed via nucleophilic α-attack of phosphines toward diynedioates (α-addition-δ-evolvement of an anion, abbreviated αAδE), undergo
Cu(II)-Promoted Oxidative Homocoupling Reaction of Terminal Alkynes in Supercritical Carbon Dioxide
作者:Huan-Feng Jiang、Jin-Yu Tang、A-Zhong Wang、Guo-Hua Deng、Shao-Rong Yang
DOI:10.1055/s-2006-926372
日期:——
Oxidative homocoupling reaction of various terminal alkynes in supercritical carbondioxide (scCO 2 ) has been reported. The final optimized reaction conditions for the reaction in scCO 2 were determined to be cupric chloride (2 mmol), sodium acetate (2 mmol), methanol (1 mL) and CO 2 (14 MPa) at 40 °C. Sodium acetate was superior to pyridine in the present reaction system. Methanol, as a co-solvent
Scope and Limitations of Functionalized Acetylenic Triflones in the Direct Alkynylation of C-H Bonds.
作者:Jason Xiang、Wanlong Jiang、P.L Fuchs
DOI:10.1016/s0040-4039(97)01577-3
日期:1997.9
Reactions of TIPS-substituted acetylenic triflones extends the versatility of the trifluoromethyl radical mediated C-Halkynylationreaction. Alkynes bearing acetylenic or propargylic oxygen functionality cannot be prepared, but silyl ethers or chlorides in remote positions may be carried through the reaction. Crown ethers are successfully monofunctionalized and distal bis-acetylenes may be employed
Cobalt Catalyzed, Regioselective C(<i>sp</i><sup>2</sup>)–H Activation of Amides with 1,3-Diynes
作者:Subban Kathiravan、Ian A. Nicholls
DOI:10.1021/acs.orglett.7b02119
日期:2017.9.15
functional class of interest in a range of application areas, to form isoquinolinones—an important structural motif in a number of biologicallyactive substances—is presented. This versatile and inexpensive catalyst employs a covalently attached bidendate-directing group, 8-aminoquinoline. The template directs the C–H activation and facilitates the synthesis of a wide range of alkynylated heterocycles
Copper immobilized on nano-silica triazine dendrimer (Cu(<scp>ii</scp>)-TD@nSiO<sub>2</sub>) catalyzed synthesis of symmetrical and unsymmetrical 1,3-diynes under aerobic conditions at ambient temperature