Gold-Catalyzed Hydrophenoxylation of Propargylic Alcohols and Amines: Synthesis of Phenyl Enol Ethers
作者:Victor Laserna、Catherine Jeapes Rojas、Tom D. Sheppard
DOI:10.1021/acs.orglett.9b01208
日期:2019.6.21
A practical method for the synthesis of phenyl enol ethers is reported. The combination of a gold(I) catalyst and potassium carbonate selectively mediates the addition of phenols to propargylic alcohols/amines in a chemo-, regio-, and stereoselective fashion in high yield. The resulting enol ethers are formed exclusively with a Z-configuration and can be obtained from a wide array of phenols and propargylic
Process for the preparation of bromoarylacetylene and aryldiacetylene
申请人:Gulf Research & Development Company
公开号:US04223172A1
公开(公告)日:1980-09-16
Bromoarylacetylenes such as m-bromophenylacetylene and certain precursors to such bromoarylacetylene are prepared by reacting an aryldibromide with a substituted terminal acetylene compound containing at least three carbon atoms and a hydroxy group on the carbon atom adjacent to the acetylene group in the presence of a dialkyl or trialkyl amine solvent and a catalyst system consisting of a palladium complex containing two halogen moieties and two tri-substituted phosphine moieties. Additional triphenylphosphine can be added. A cuprous iodide promoter is also employed in the reaction sequence. The bromoarylacetylenes can be reacted with a substituted terminal acetylene compound as defined using the same catalyst system as defined to produce the corresponding aryldihydroxy substituted acetylenes. Certain bromophenylhydroxy substituted acetylenes are claimed as new compositions.
Synthesis and anion binding properties of m-diethynylbenzene expanded calix[4]pyrrole
作者:Jung-Hwa Choi、Dong-Gyu Cho
DOI:10.1016/j.tetlet.2013.10.046
日期:2013.12
A new expanded calix[4]pyrrole, calix[2]diethynylbenzene[4]pyrrole (3), was synthesized from a bispyrrole intermediate (1,3-bis(3-methyl-3-(1H-pyrrol-2-yl)but-1-ynyl)benzene). The anionbinding properties of calixpyrrole 3 were also investigated. Calixpyrrole 3 was found to bind dihydrogen phosphate (H2PO4-) anions better than others. The structure of 3 H2PO4- was optimized using semiempirical PM3