Kinetic analysis was used as a tool for rational optimization of a catalytic, direct substitution of alcohols to enable the selective formation of unsymmetrical ethers, thioethers, and Friedel–Crafts alkylation products using a moisture-tolerant and commercially available zirconium complex (2 to 8 mol%). Operating in air and in the absence of dehydration techniques, the protocol furnished a variety
Synthesis of a component of the essential oil ofHibiscus syriacus
作者:V. M. Andreev、A. I. Bibicheva
DOI:10.1007/bf00714928
日期:——
Among the 65 identified components of the essentialoil of Hibiscussyriacus L. (shrub althea), which is an alternative host of Anthonomus grandis Boheman (the boll weevil), 1.2% of a hitherto unknown compound -phenethyl 3-methylbut-2-enyl ether, or 2-methyl-7-phenyl-5oxahept-2-ene (I), has been found [I]. The use of (I) as a perfume material and its synthesis were later described in a paper [2] according
Intermolecular Hydroamination of Allenes with <i>N</i>-Unsubstituted Carbamates Catalyzed by a Gold(I) <i>N</i>-Heterocyclic Carbene Complex
作者:Robert E. Kinder、Zhibin Zhang、Ross A. Widenhoefer
DOI:10.1021/ol8010858
日期:2008.7.17
Reaction of 2,3-pentadienyl benzoate with benzyl carbamate catalyzed by a 1:1 mixture of (NHC)AuCl and AgOTf in dioxane at 23 degrees C for 5 h led to isolation of (E)-4-(benzyloxycarbonylamino)-2-pentenyl benzoate in 84% yield as a single regio- and diastereomer. Gold(I)-catalyzed hydroamination was effective for a number of N-unsubstituted carbamates and a range of substituted allenes.