for the synthesis of fluorene and its derivatives starting from 2-iodobiphenyls and CH2Br2. A range of fluorene derivatives can be synthesized under relatively mild conditions. The reaction proceeds via a tandem palladium-catalyzed dual C–C bond formation sequence through the key dibenzopalladacyclopentadiene intermediates, which are obtained from 2-iodobiphenyls through palladium-catalyzed C–H activation
Selective acetylation of primary alcohols by ethyl acetate
作者:Raju Singha、Jayanta K. Ray
DOI:10.1016/j.tetlet.2016.10.088
日期:2016.11
A KOtBu and ethyl acetate mediated efficient methodology has been developed for the acetylation of primary and secondaryalcohols where ethyl acetate is the source of acetyl group. The reaction is fast, mild, efficient, and highly selective towards the primary alcohols.
已经开发了用于叔和仲醇的乙酰化的KO t Bu和乙酸乙酯介导的有效方法,其中乙酸乙酯是乙酰基的来源。该反应对伯醇快速,温和,有效且高度选择性。
Lipase-mediated selective acetylation of primary alcohols in ethyl acetate
作者:Ernane C. de Souza、Moises Romero-Ortega、Horacio F. Olivo
DOI:10.1016/j.tetlet.2017.12.041
日期:2018.1
environmental friendly process to selectively acetylate primary alcohols was demonstrated. The esterification process consists of treatment of a primary alcohol in the presence of immobilized C. antarctica lipase (Novozyme-435) in ethyl acetate at room temperature. Primary alcohols were acetylated in the presence of secondary alcohols and phenols.
Catalytic Cascade Access to Biaryl-2-Methyl Acetates from Pyruvate<i>O</i>-Arylmethyl Ketoximes<i>via</i>the Palladium-Catalyzed C(<i>sp</i><sup>2</sup>)H Bond Arylation and C−O Bond Solvolysis
作者:Ling-Yan Shao、Li-Hao Xing、Ying Guo、Kun-Kun Yu、Wei Wang、Hong-Wei Liu、Dao-Hua Liao、Ya-Fei Ji
DOI:10.1002/adsc.201800216
日期:2018.8.6
A catalytic cascade has been developed for the synthesis of biaryl‐2‐methyl acetates via a palladium‐catalyzed ortho‐C(sp2)−H bond arylation of pyruvate O‐arylmethyl ketoximes with aryl iodides followed by a solvolysis, in which the pyruvic ketoxime ester as a new auxiliary is employed to direct the C(sp2)−H bond activation. The straightforward treatment of O‐arylmethyl hydroxylamines and ethyl pyruvate
This invention relates to a range of alpha substituted 2-benzyl substituted imidazole compounds and pharmaceutically acceptable salts and solvates thereof, to compositions comprising such compounds, processes for their synthesis and their use as parasiticides.