Dihalodiphenylacetylenes are conveniently synthesized by a doubleelimination reaction of β-substituted sulfones which are readily obtained from halogen-substituted benzyl sulfone and benzaldehyde derivatives. Halogens can be incorporated at any desired positions in the diphenylacetylene skeleton simply by choosing the substitution position of the halogen on the aromatic rings of the starting compounds
Palladium-catalyzed aerobic oxidative cross-coupling of arylhydrazines with terminal alkynes
作者:Yingwei Zhao、Qiuling Song
DOI:10.1039/c5cc04111b
日期:——
The Pd-catalyzed aerobic oxidative coupling of arylhydrazines with terminal acetylenes was achieved under copper- and base-free conditions.
在无铜和无碱条件下,芳基肼与末端乙炔经Pd催化的需氧氧化偶联。
Palladium-Catalyzed Desulfitative Cross-Coupling of Arylsulfonyl Hydrazides with Terminal Alkynes: A General Approach toward Functionalized Internal Alkynes
A palladium-catalyzed Sonogashira-type coupling between arylsulfonyl hydrazides and terminalalkynes via Ar(C)–S bond cleavage is disclosed, which enables the general synthesis of functionalized internalalkynes, especially the Br-substituted ones, in good to excellent yields under acid- and base-free conditions.
Ligand-controlled iridium-catalyzed semihydrogenation of alkynes with ethanol: highly stereoselective synthesis of <i>E</i>- and <i>Z</i>-alkenes
作者:Jinfei Yang、Chengniu Wang、Yufeng Sun、Xuyan Man、Jinxia Li、Fei Sun
DOI:10.1039/c8cc09714c
日期:——
iridium-catalyzed semihydrogenation of alkynes to E- and Z-alkenes with ethanol was developed. Effective selectivity control was achieved by ligand regulation. The use of 1,2-bis(diphenylphosphino)ethane (DPPE) and 1,5-cyclooctadiene (COD) was critical for the stereoselective semihydrogenation of alkynes. The general applicability of this procedure was highlighted by the synthesis of more than 40 alkenes, with