Indium(III) Bromide-Catalyzed Chemioselective Dimerization of Vinylarenes
作者:Clovis Peppe、Ernesto Schulz Lang、Fabiano Molinos de Andrade、Liérson Borges de Castro
DOI:10.1055/s-2004-829557
日期:——
Indium(III) bromide catalyzes the dimerization of α-substituted vinylarenes. Chemioselectivity towards open chain or cyclic dimers depends on the nature of the substituent at the aryl group of the vinylarene.
Metal-Free Domino One-Pot Decarboxylative Cyclization of Cinnamic Acid Esters: Synthesis of Functionalized Indanes
作者:Alavala Gopi Krishna Reddy、Gedu Satyanarayana
DOI:10.1021/acs.joc.6b02015
日期:2016.12.16
Their formation can be explained via acid triggered decarboxylation of cinnamic acid esters and subsequent inter/intramolecular cyclization. Overall process involves in the intramolecular cleavage of two σ-bonds (C–O and C–C) and inter/intramolecular construction of two/one C–C σ-bond(s). Significantly, this protocol was successful without the aid of any metal salts.
Acid-promoted SN1/E1 fragmentation/dimerization of 2-cumylmalonates
作者:Jonathan T. Reeves、Daniel R. Fandrick、Zhulin Tan、Jinhua J. Song、Nathan K. Yee、Chris H. Senanayake
DOI:10.1016/j.tetlet.2009.04.022
日期:2009.6
Several diethyl 2-cumylmalonates underwent fragmentation and dimerization in PPA at elevated temperatures to give 1,1,3-trimethyl-3-arylindanes in good yields. The same products were obtained from 2-cumylmalonic acid, ethyl 2-cumylcyanoacetate, and 2-cumyl Meldrum’s acid. This represents the first example of an SN1/E1 ionization with diethyl malonate as the leaving group.
几种2-枯基丙二酸二乙酯在升高的温度下在PPA中进行裂解和二聚,从而以良好的收率得到1,1,3-三甲基-3-芳基茚满。相同的产物得自2-枯基丙二酸,2-枯基氰基乙酸乙酯和2-枯基梅德鲁姆酸。这代表了以丙二酸二乙酯作为离去基团进行S N 1 / E1电离的第一个例子。
Carbon-Based Leaving Group in Substitution Reactions: Functionalization of sp<sup>3</sup>-Hybridized Quaternary and Tertiary Benzylic Carbon Centers
作者:Stuart J. Mahoney、Tiantong Lou、Ganna Bondarenko、Eric Fillion
DOI:10.1021/ol301442z
日期:2012.7.6
Lewis acid promoted substitution reactions employing Meldrum’s acid and 5-methyl Meldrum’s acid as carbon-based leavinggroups are described which transform unstrained quaternary and tertiary benzylic Csp3–Csp3 bonds into Csp3–X bonds (X = C, H, N). Importantly, this reaction has a broad scope in terms of both suitable substrates and nucleophiles with good to excellent yields obtained (typically >90%)
Combinations of Ethers and B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>Function as Hydrogenation Catalysts
作者:Lindsay J. Hounjet、Christoph Bannwarth、Christian N. Garon、Christopher B. Caputo、Stefan Grimme、Douglas W. Stephan
DOI:10.1002/anie.201303166
日期:2013.7.15
It works ether way: Labile adducts of dialkyl ethers with the electrophilic borane B(C6F5)3 are shown to scramble HD to H2 and D2 and catalyze the hydrogenation of 1,1‐diphenylethylene.
它以醚的方式起作用:二烷基醚与亲电硼烷B(C 6 F 5)3的不稳定加合物显示出将HD扰乱为H 2和D 2并催化1,1-二苯基乙烯的加氢反应。