Synthesis of α-Diketones from Alkylaryl- and Diarylalkynes Using Mercuric Salts
摘要:
Both alkylarylalkynes and diarylalkynes 1 are converted into the alpha-diketones 2 in good yield by the use of mercuric salts, e.g., mercuric nitrate hydrate or mercuric triflate, in the presence of water. Other mercuric salts, e.g., sulfate, chloride, acetate, or trifluoroacetate, do not provide the diketone product. A possible mechanism is proposed.
Synthesis of α-heterosubstituted ketones through sulfur mediated difunctionalization of internal alkynes
作者:Zhong Zhang、Yuzheng Luo、Hongguang Du、Jiaxi Xu、Pingfan Li
DOI:10.1039/c9sc00568d
日期:——
Synthesis of α-heterosubstituted ketones was achieved through sulfur mediated difunctionalization of internal alkynes in one pot. The reaction design involves: phenyl substituted internal alkyne attacking triflic anhydride activated diphenyl sulfoxide to give a sulfonium vinyl triflate intermediate, hydrolysis to give an α-sulfonium ketone, and then substitution with various nucleophiles. This method
Ind2TiMe2-Catalyzed Addition of Methyl- and Ethylamine to Alkynes
作者:Klaudia Marcseková、Bernd Wegener、Sven Doye
DOI:10.1002/ejoc.200500458
日期:2005.11
simple hydrogenation-like experimental protocol for the addition of gaseous methyl- and ethylamine to alkynes in the presence of Ind2TiMe2 as the catalyst. For efficient hydroamination reactions it is sufficient to stir a mixture of the alkyne and the catalyst in toluene at temperatures between 80 °C (terminal alkynes) and 105 °C (internal alkynes) under a constant pressure of 1 atm of the corresponding
A ligand‐controlled regiodivergent and enantioselectivecopper‐catalyzed intermolecular hydroallylation of alkynes with allylic phosphates and hydrosilanes has been achieved for the first time. The chiral bidentate sulfonate‐containing N‐heterocyclic carbene ligated CuCl complex leads to enantioenriched SN2′‐type products, whereas the use of the IMesCuCl catalyst affords SN2‐type products. Thus a range
炔烃与烯丙基磷酸酯和氢硅烷的配体控制的区域发散性和对映选择性铜催化的分子间氢化反应已经实现。含手性双齿磺酸盐的N杂环卡宾连接的CuCl配合物可生成对映体富集的S N 2'型产物,而IMesCuCl催化剂的使用可提供S N 2型产物。因此,可以容易地从易得的炔烃以区域发散的方式容易地合成一系列手性支化和非手性线性1,4-二烯。
A Flexible and Catalytic One-Pot Procedure for the Synthesis of Indoles