Direct synthesis of 1,1-diarylalkenes from alkenyl phosphates via nickel(0)-catalysed Suzuki–Miyaura coupling
作者:Anders L. Hansen、Jean-Philippe Ebran、Thomas M. Gøgsig、Troels Skrydstrup
DOI:10.1039/b609064h
日期:——
A combination of Ni(COD)(2) and PCy(3) promotes effectively the Suzuki-Miyaura cross coupling of 1-arylalkenyl phosphates with aryl boronic acids with yields attaining 99%.
Visible-Light-Enabled Oxidative Coupling of Alkenes with Dialkylformamides To Access Unsaturated Amides
作者:Maojian Lu、Zhaowei Lin、Shanyi Chen、Hongyou Chen、Mingqiang Huang、Shunyou Cai
DOI:10.1021/acs.orglett.9b03870
日期:2019.12.20
A practical and direct method for oxidative cross-coupling of alkenes with dialkylformamides is established employing visible-light-enabled photoredox catalysis. This strategy allows efficient access to diverse unsaturated amides under mild reaction conditions. The application of an appropriate diaryliodonium salt was demonstrated to be critical to the success of this process. This catalyst system
The carbonyl compounds, synthesized by the oxidative cleavage of their corresponding olefins, are of great significance in organic synthesis, especially aryl ketones. We have developed a gentle and effective protocol, using acid red 94 as the organic metal-free photocatalyst, O2 as the oxidant, and water as the solvent. Under visible light irradiation, aryl ketone derivatives were obtained in moderate
Rhodium-Catalyzed Cross-Coupling of Organoboron Compounds with Vinyl Acetate
作者:Jung-Yi Yu、Ryoichi Kuwano
DOI:10.1002/anie.200903146
日期:2009.9.14
A new coupling partner: Vinylacetate couples with organoboroncompounds in the presence of a rhodium catalyst; carbon–carbon bond formation occurs on the vinylic carbon attached to the acetoxy group. Conventional nickel and palladium catalysts were found to be ineffective for the reaction.
Preparation and Synthetic Applications of Aryl Tetraflates (ArOSO<sub>2</sub>CF<sub>2</sub>CF<sub>2</sub>H)
作者:Vsevolod V. Rostovtsev、Lois M. Bryman、Christopher P. Junk、Mark A. Harmer、Liane G. Carcani
DOI:10.1021/jo701630a
日期:2008.1.1
onic acid (HCF2CF2SO3H, TFESA) and explored the applications of this newly available superacid in catalysis. Low volatility, ease of handling, and a convenient 1H NMR handle make this acid an attractive alternative to triflicacid. TFESA can also be converted to several of its derivatives: anhydride, sulfonyl chloride, and sulfonyl fluoride, which provide a good entry point for the synthesis of aryl
我们最近开发了一种改进的合成路线,以合成1,1,2,2-四氟乙烷磺酸(HCF 2 CF 2 SO 3 H,TFESA),并探索了这种新获得的超强酸在催化中的应用。挥发性低,易于处理且方便11 H NMR处理使该酸成为三氟甲磺酸的有吸引力的替代物。TFESA也可以转化为几种衍生物:酸酐,磺酰氯和磺酰氟,它们为芳基磺酸盐的合成提供了良好的切入点。我们制备了1,1,2,2-四氟乙烷磺酸的几种芳基酯(芳基四氟甲磺酸),表明它们可用于许多钯催化的偶联反应(Suzuki,Heck和Buchwald-Hartwig偶联)。虽然四氟甲磺酸酯的反应性介于三氟甲磺酸酯和氯化物之间,但四氟甲磺酸酯似乎更热稳定。另外,四氟甲磺酸酯基团中氢原子的存在促进了反应的监测和衍生物的表征。