DBU-Mediated Efficient Synthesis of Diaryl Ethynes and Enynes from 1,1-Dibromoalkenes at Room Temperature
作者:Yadagiri Thummala、Ashok K. Morri、Galla V. Karunakar、Venkata Ramana Doddi
DOI:10.1002/ejoc.201801143
日期:2018.12.6
The DBU plays a triple role as base, nucleophile and ligand in the synthesis of internal alkynes from 1,1‐dibromoalkenes at ambient temperature.
在环境温度下,DBU在由1,1-二溴代烯烃合成内部炔烃中,起着碱基,亲核试剂和配体的三重作用。
Palladium-Catalyzed Modular Assembly of Electron-Rich Alkenes, Dienes, Trienes, and Enynes from (<i>E</i>)-1,2-Dichlorovinyl Phenyl Ether
作者:Laina M. Geary、Philip G. Hultin
DOI:10.1021/jo1014678
日期:2010.10.1
devised a modular construction of electron-rich alkene derivatives from trichloroethylene (TCE). The three C−Cl bonds of TCE have sufficiently different reactivities that they can be sequentially and selectively functionalized. Following the substitution of one chlorine by phenol to generate (E)-1,2-dichlorovinyl ether, the C1-Cl group next participates in palladium-catalyzed cross-coupling reactions with
Modular Construction of 2-Substituted Benzo[b]furans from 1,2-Dichlorovinyl Ethers
作者:Laina M. Geary、Philip G. Hultin
DOI:10.1021/ol902307m
日期:2009.12.3
(E)-1,2-Dichlorovinyl ethers and amides are easily accessible from trichloroethylene via nucleophilic addition across in situ synthesized dichloroacetylene. A one-pot, sequential Suzuki-Miyaura coupling/intramolecular direct arylation between dichlorovinyl ethers and organoboronic acids provides easy access to a variety of benzofurans in only two steps from inexpensive commercially available compounds. The method is extendable to the preparation of indoles from the analogous dichlorovinyl amides.
2-Substituted Benzo[b]furans from (E)-1,2-Dichlorovinyl Ethers and Organoboron Reagents: Scope and Mechanistic Investigations into the One-Pot Suzuki Coupling/Direct Arylation
作者:Laina M. Geary、Philip G. Hultin
DOI:10.1002/ejoc.201000787
日期:2010.10
phenols, boronic acids or other organoboron reagents, and trichloroethylene. The overall process requires only two synthetic steps, with the key step being a one-pot sequential Suzukicross-coupling/direct arylationreaction. The method tolerates many useful functional groups and does not require the installation of any other activating functionality. The modular nature of the process permits the rapid
Regio- and Stereoselective Synthesis of 1,2-Dihaloalkenes Using In-Situ-Generated ICl, IBr, BrCl, I2, and Br2
作者:Xiaojun Zeng、Shiwen Liu、Yuhao Yang、Yi Yang、Gerald B. Hammond、Bo Xu
DOI:10.1016/j.chempr.2020.03.011
日期:2020.4
2-trans-dihalogenation of alkynes with an unprecedented substrate scope and exclusive regio- and stereoselectivity. This versatile dihalogenation system—a combination of NX1S electrophile and alkali metal halide (MX2) in acetic acid—is applicable for diverse categories of alkynes (electron-rich or poor alkynes, internal and terminalalkynes, or heteroatoms such as O-, N-, S-substituted alkynes). The hydrogen
我们描述了炔烃的无催化剂的1,2-反式二卤代反应,具有空前的底物范围和排他性和立体选择性。这种多功能的二卤化系统-NX 1 S亲电试剂和乙酸中的碱金属卤化物(MX 2)的组合-适用于各种类型的炔烃(富电子或弱炔烃,内部和末端炔烃,或杂原子,例如O- ,N-,S-取代的炔烃)。氢键供体溶剂乙酸对于就地生成X 1 X 2亲电试剂(包括ICl,IBr,BrCl,I 2和Br 2)是必不可少的。