Metal-Free C–H Functionalization of Alkanes by Aryldiazoacetates
作者:Cecilia Tortoreto、Daniel Rackl、Huw M. L. Davies
DOI:10.1021/acs.orglett.6b03681
日期:2017.2.17
Thermally induced reactions of donor/acceptor diazo compounds generate carbene intermediates capable of C–H functionalization reactions of alkanes. A variety of C–H insertion products were obtained in moderate to good yields and in certain cases with good site selectivity, favoring the functionalization of the more highly substituted C–H bond.
Stereoselective Synthesis of Highly Functionalized Cyclohexenes via Strong-Acid-Mediated Endocyclic C–C Bond Cleavage of Monocyclopropanated Cyclopentadienes
作者:Sebastian Fischer、Terrence-Thang H. Nguyen、Andreas Ratzenboeck、Huw M. L. Davies、Oliver Reiser
DOI:10.1021/acs.orglett.3c00935
日期:2023.6.23
A stereoselective, solvent- and metal-free endocyclic C–Cbondcleavage of monocyclopropanated cyclopentadienes mediated by strong acids was developed, leading to highly functionalized six-membered carbocycles with high stereocontrol. The critical step for this ring-expansion is the formation of a cyclopropyl carbocation that undergoes endocyclic ring opening via an SN2′-type attack of various nucleophiles
开发了一种由强酸介导的单环丙烷化环戊二烯的立体选择性、无溶剂和金属的环内 C-C 键断裂,产生具有高度立体控制的高度官能化的六元碳环。这种扩环的关键步骤是环丙基碳正离子的形成,环丙基碳正离子通过各种亲核试剂的 SN 2 ' 型攻击进行环内开环。随后的合成转化显示了所得环己烯对于合成具有非常规取代模式的新化合物的多功能性。
Effect of deuterated solvents toward 2,2,2-trichloroethyl esters with a benzylic methylene moiety
The indium-promoted chemoselective deprotection of 2,2,2-trichloroethyl esters containing a benzylic methylene was successfully achieved by employing deuterated solvents. (C) 2010 Elsevier Ltd. All rights reserved.
2,2,2-Trichloroethyl Aryldiazoacetates as Robust Reagents for the Enantioselective C–H Functionalization of Methyl Ethers
作者:David M. Guptill、Huw M. L. Davies
DOI:10.1021/ja5107404
日期:2014.12.24
A new class of reagents is described for C-H functionalization by means of C-H insertion using donor/acceptor-substituted rhodium(II) carbene intermediates. The 2,2,2-trichloroethyl aryl and heteroaryl diazoacetates, together with the dirhodium triarylcyclopropane carboxylate catalyst Rh2(R-BPCP)4, enabled the enantioselective intermolecular C-H functionalization of a range of methyl ethers with high levels of site selectivity and enantioselectivity.
Indium-mediated chemoselective deprotection and demonochlorination of 2,2,2-trichloroethyl esters
作者:Tomoko Mineno、Hisao Kansui、Takehisa Kunieda
DOI:10.1016/j.tetlet.2007.05.099
日期:2007.7
On treatment with indium metal, the 2,2,2-trichloroethyl carboxylates smoothly undergo deprotection to carboxylic acids and reductive demonochlorination to 2,27dichloroethyl esters, sharply depending on their structures. (C) 2007 Elsevier Ltd. All rights reserved.