A transition-metal-free Heck-type reaction between alkenes and alkyl iodides enabled by light in water
作者:Wenbo Liu、Lu Li、Zhengwang Chen、Chao-Jun Li
DOI:10.1039/c5ob00515a
日期:——
A transition-metal-free coupling protocol between various alkenes and non-activated alkyl iodides has been developed by using photoenergy in water for the first time. Under UV irradiation and basic aqueous conditions, various alkenes efficiently couple with a wide range of non-activated alkyl iodides. A tentative mechanism, which involves an atom transfer radical addition process, for the coupling
Irradiation-Induced Palladium-Catalyzed Decarboxylative Heck Reaction of Aliphatic <i>N</i>-(Acyloxy)phthalimides at Room Temperature
作者:Guang-Zu Wang、Rui Shang、Yao Fu
DOI:10.1021/acs.orglett.8b00023
日期:2018.2.2
It is reported that Pd(PPh3)2Cl2 in combination with 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene (Xantphos) under irradiation of blue LEDs efficiently catalyzes a decarboxylative Heck reaction of vinyl arenes and vinyl heteroarenes with aliphatic N-(acyloxy)phthalimides at roomtemperature. A broad scope of secondary, tertiary, and quaternary carboxylates, including α-amino acid derived esters
Copper-catalyzed oxidative decarboxylative alkylation of cinnamic acids with 4-alkyl-1,4-dihydropyridines
作者:Dong Zhang、Zi-Liang Tang、Xuan-Hui Ouyang、Ren-Jie Song、Jin-Heng Li
DOI:10.1039/d0cc06401g
日期:——
We have developed a new oxidative decarboxylation of cinnamic acids with 4-alkyl-1,4-dihydropyridines to construct C(sp3)-C(sp2) bond in the presence of copper catalyst and dicumyl peroxide (DCP). A variety of internal alkenes have been obtained with mild condition, broad substrates scope and excellent functional groups tolerance. This method has significant potential for application by using inexpensive
Photoinduced, Copper-Promoted Regio- and Stereoselective Decarboxylative Alkylation of α,β-Unsaturated Acids with Alkyl Iodides
作者:Chao Wang、Yingjie Lei、Mengzhun Guo、Qinyu Shang、Hong Liu、Zhaoqing Xu、Rui Wang
DOI:10.1021/acs.orglett.7b03289
日期:2017.12.1
The first example of UV light-induced, copper-catalyzed regio- and stereoselective decarboxylative coupling of α,β-unsaturated acids with alkyl iodides was reported. Under standard conditions, the 1°, 2°, and 3° alkyl iodides proceeded smoothly with the E-selective alkenes obtained in uniformly good yields and high stereoselectivities.
<i>Z</i>-Selective Olefin Synthesis via Iron-Catalyzed Reductive Coupling of Alkyl Halides with Terminal Arylalkynes
作者:Chi Wai Cheung、Fedor E. Zhurkin、Xile Hu
DOI:10.1021/jacs.5b01784
日期:2015.4.22
Selective catalytic synthesis of Z-olefins has been challenging. Here we describe a method to produce 1,2-disubstituted olefins in high Z selectivity via reductive cross-coupling of alkylhalides with terminal arylalkynes. The method employs inexpensive and nontoxic catalyst (iron(II) bromide) and reductant (zinc). The substrate scope encompasses primary, secondary, and tertiaryalkylhalides, and