Measuring the Relative Reactivity of the Carbon–Hydrogen Bonds of Alkanes as Nucleophiles
作者:Andrea Olmos、Riccardo Gava、Bárbara Noverges、Delia Bellezza、Kane Jacob、Maria Besora、W. M. Chamil Sameera、Michel Etienne、Feliu Maseras、Gregorio Asensio、Ana Caballero、Pedro J. Pérez
DOI:10.1002/anie.201807448
日期:2018.10.15
We report quantitative measurements of the relative reactivities of a series of C−H bonds of gaseous or liquid CnH2n+2 alkanes (n=1–8, 29 different C−H bonds) towards in situ generated electrophiles (copper, silver, and rhodium carbenes), with methane as the reference. This strategy surpasses the drawback of previous model reactions of alkanes with strong electrophiles suffering from C−C cleavage processes
我们报告了一系列测量结果,这些测量结果是一系列气态或液态C n H 2 n +2烷烃(n = 1–8,29种不同的C H键)的CH键对原位生成的亲电试剂(铜,银和铑卡宾),并以甲烷为参考。该策略克服了以前的烷烃与强亲电试剂经历C-C裂解过程的模型反应的缺点,该模型无法直接比较烷烃CH键的相对反应性。
Functionalization of C<sub><i>n</i></sub>H<sub>2<i>n</i>+2</sub>Alkanes: Supercritical Carbon Dioxide Enhances the Reactivity towards Primary Carbon-Hydrogen Bonds
作者:Riccardo Gava、Andrea Olmos、Bárbara Noverges、Teresa Varea、Ignacio Funes-Ardoiz、Tomás R. Belderrain、Ana Caballero、Feliu Maseras、Gregorio Asensio、Pedro J. Pérez
DOI:10.1002/cctc.201500610
日期:2015.10
catalytic system. The copper complex Cu(NCMe) ( =hydrotris[3,5‐bis(trifluoromethyl)‐4‐bromo]‐pyrazol‐1‐yl}borate) catalyzes the functionalization of CnH2n+2 with ethyldiazoacetate upon inserting the CHCO2Et unit into C−H bonds. In addition, the selectivity of the reaction toward the primary sites significantly increased relative to that obtained in neat alkane upon using supercritical carbon dioxide
烷烃主要位点的功能化是催化领域更具挑战性的领域之一。在这种情况下,已经发现了一种新颖的作用,该作用可增强催化体系中烷烃的一级碳氢键的反应性。铜配合物Cu(NCMe)(= hydrotris [3,5-双(三氟甲基)-4-溴]吡唑-1-基}硼酸酯)在插入时催化重氮乙酸乙酯对C n H 2 n +2的功能化CHCO 2Et单元成CH键。另外,与使用超临界二氧化碳作为反应介质的纯烷烃相比,该反应对主要位点的选择性显着提高。这归因于二氧化碳分子从配体的氟原子中撤出电子密度的作用,从而增强了金属中心的亲电性质。DFT研究验证了该建议。
Electrochemical Reaction of Organoboranes in the Presence of Propenoic Acid Esters. A Convenient Carboxylic Ester Synthesis from Organoboranes
platinum electrodes in the presence of α,β-unsaturated esters in an acetonitrile solution containing tetraalkylammonium halide as a supporting electrolyte, produces the corresponding alkylated carboxylic acid esters in good yields.
Water as the Reaction Medium for Intermolecular C–H Alkane Functionalization in Micellar Catalysis
作者:María Álvarez、Riccardo Gava、Manuel R. Rodríguez、Silvia G. Rull、Pedro J. Pérez
DOI:10.1021/acscatal.6b03669
日期:2017.5.5
A series of alkanes CnH2n+2 have been functionalized in water as the reaction medium, using a silver-based catalyst, upon the insertion of carbene (CHCO2Et from N2CHCO2Et) groups into the carbon–hydrogenbonds of hexane, cyclohexane, or 2-methylbutane, among others. The regioselectivity toward the distinct reaction sites is identical to that found in neat alkane, the water-based system allowing the
在插入卡宾(N 2 CHCO 2中的CHCO 2 Et)后,使用银基催化剂在水中将一系列烷烃C n H 2 n +2作为反应介质进行了功能化。Et)包括己烷,环己烷或2-甲基丁烷等的碳氢键。对不同反应位点的区域选择性与在纯烷烃中发现的区域选择性相同,该水基体系允许使用短得多的过量烃。这是在水中用这种方法对烷烃进行分子间官能化的第一个例子。在这种性质的空前的串联反应中,官能化的烷烃部分地引入第二个碳烯单元以提供α-(酰氧基)乙酸酯。
Agent for treating hepato biliary diseases
申请人:R-TECH UENO, LTD.
公开号:EP0690049A2
公开(公告)日:1996-01-03
The object of the present invention is to provide a pharmaceutical composition for treatment of hepato·biliary disease reduced in side effect such as diarrhea, which comprises 16,16-difluoro-15-keto-PGs having at least one methyl group or ethyl group on the carbon atom at the 17- or 18-position or adjacent to the terminal methyl group of ω-chain as an essential component.