Meta Halogenation of 1,3-Disubstituted Arenes via Iridium-Catalyzed Arene Borylation
作者:Jaclyn M. Murphy、Xuebin Liao、John F. Hartwig
DOI:10.1021/ja076498n
日期:2007.12.1
copper(II) bromide or chloride converts arylboronic esters to the corresponding aryl halides. A variety of arenes containing alkoxy, alkyl, halogen, nitrile, ester, amide, and pivaloyl and TIPS-protected alcohols were converted to the corresponding 3,5-disubstituted aryl bromides and chlorides in yields ranging from 46% to 85%. In addition, 2,6-disubstituted and 3-substituted pyridines were converted
Synthesis of acremines A, B and F and studies on the bisacremines
作者:Nils Winter、Dirk Trauner
DOI:10.3762/bjoc.15.219
日期:——
fungi of the genus Acremonium. Here, we present the asymmetric total synthesis of acremine F which hinges on a modestly enantioselective dihydroxylation and a subsequent kinetic resolution via a highly selective asymmetric reduction. Chemoselective oxidation of acremine F gave access to acremines A and B. The dimerization of acremine F to bisacremine E was investigated but could not be achieved, shedding
Highly Selective Trifluoromethylation of 1,3-Disubstituted Arenes through Iridium-Catalyzed Arene Borylation
作者:Tianfei Liu、Xinxin Shao、Yaming Wu、Qilong Shen
DOI:10.1002/anie.201106673
日期:2012.1.9
The old one two: A sequential iridium‐catalyzedborylation and copper‐catalyzed trifluoromethylation of arenes is described (see scheme; Pin=pinacol). The reaction is conducted under mild reaction conditions and tolerates a variety of functional groups. The advantages of this tandem procedure are demonstrated by the late‐stage trifluoromethylation of a number of biologically active molecules.
Rapid Assessment of Protecting-Group Stability by Using a Robustness Screen
作者:Karl D. Collins、Andreas Rühling、Fabian Lied、Frank Glorius
DOI:10.1002/chem.201304508
日期:2014.3.24
establish the stability of widely utilized silyl, acetal, and carbamateprotectinggroups to a given set of reaction conditions. Assessment of up to twelve protectinggroups in a single experiment has been demonstrated. Evaluation of this protocol in two unrelated synthetic transformations suggests that this method can be used to select appropriate protectinggroups in the design of synthetic routes.
Sterically Controlled Late-Stage C–H Alkynylation of Arenes
作者:Arup Mondal、Hao Chen、Lea Flämig、Philipp Wedi、Manuel van Gemmeren
DOI:10.1021/jacs.9b10868
日期:2019.11.27
Phenylacetylenes are key structural motifs in organic chemistry, which find widespread applications in bioactive molecules, synthetic intermediates, functional materials and reagents. These molecules are typically prepared from pre-functionalized starting materials, e.g. using the Sonogashiracoupling, or using directing group-based C-H activation strategies. While highly efficient, these approaches