A ruthenium-catalyzed coupling of alkynes with 1,3-diketones
摘要:
Ruthenium(III) chloride hydrate is a convenient catalyst for the addition of active methylene compounds to aryl alkynes. These reactions are rapid, operationally simple, and high yielding in cases. Most significantly, no precautions are required to exclude air or water from the reactions. All reagents are commercially available at reasonable prices, and the reactions can be conducted in disposable glassware with minimal solvent. (C) 2012 Elsevier B.V. All rights reserved.
Hydro(trispyrazolyl)borato-Ruthenium(II) Diphosphinoamino Complex-Catalyzed Addition of β-Diketones to 1-Alkynes and Anti-Markovnikov Addition of Secondary Amines to Aromatic 1-Alkynes
作者:Hung Wai Cheung、Chau Ming So、Kwok Hung Pun、Zhongyuan Zhou、Chak Po Lau
DOI:10.1002/adsc.201000567
日期:2011.2.11
[Tp=hydro(trispyrazolyl)borate] catalyzes the Markovnikov addition of β-diketones to unactivated 1-alkynes in good to excellent yields. The reaction proceeds under solvent-free and additive-free conditions and the catalyst loading can be reduced down to 0.4 mol%. Complex I (1 mol%) also catalyzes the addition of secondaryamines to aromatic terminal alkynes, unusual anti-Markovnikov products are exclusively
氢(三吡唑基)硼酸钌(II)二膦氨基配合物TpRu [4-CF 3 C 6 H 4 N(PPh 2)2 ](OTf)(I)[Tp =氢(三吡唑基)硼酸]催化Markovnikov加成β-二酮与未活化的1-炔具有良好至极好的收率。反应在无溶剂和无添加剂的条件下进行,催化剂的负载量可降低至0.4mol%。配合物I(1摩尔%)还催化向芳族末端炔烃中添加仲胺,从而形成了独特的反马尔科夫尼科夫产物。
Nebenprodukte bei klassischen ?-Diketonen-Synthesen
作者:W. Mickler、E. Uhlemann、R. Herzschuh
DOI:10.1002/prac.19923340512
日期:——
Synergistic Au/Ga Catalysis in Ambient Nakamura Reaction
作者:Yumeng Xi、Dawei Wang、Xiaohan Ye、Novruz G. Akhmedov、Jeffrey L. Petersen、Xiaodong Shi
DOI:10.1021/ol403337u
日期:2014.1.3
The gold-catalyzed intermolecular addition of 1,3-dicarbonyl compounds to unactivated 1-alkynes (Nakamura reaction) is achieved at room temperature for the first time through synergistic gold/gallium catalysis. The developed system is highly efficient with a gold catalyst loading that can be as low as 500 ppm.