In Situ Phosphine Oxide Reduction: A Catalytic Appel Reaction
作者:Henri A. van Kalkeren、Stefan H. A. M. Leenders、C. Rianne A. Hommersom、Floris P. J. T. Rutjes、Floris L. van Delft
DOI:10.1002/chem.201101563
日期:2011.9.26
reactions in organic chemistry thrive on stoichiometric formation of phosphineoxides from phosphines. To avoid the resulting burden of waste and purification, cyclic phosphineoxides were evaluated for new catalytic reactions based on in situ regeneration. First, the ease of silane‐mediated reduction of a range of cyclic phosphineoxides was explored. In addition, the compatibility of silanes with electrophilic
Palladium-catalyzed double cross-coupling reaction of 1,2-bis(pinacolatoboryl)alkenes and -arenes with 2,2′-dibromobiaryls: annulative approach to functionalized polycyclic aromatic hydrocarbons
This study demonstrates that the doublecross-coupling reaction of 1,2-bis(pinacolatoboryl)alkenes and -arenes with 2,2′-dibromobiaryls proceeds smoothly with the aid of a catalytic amount of Pd(PPh3)4 in the presence of excess base to give a variety of polycyclic aromatic hydrocarbons, such as phenanthrenes, [5]helicene, dithienobenzenes, triphenylenes, dibenzo[g,p]chrysenes, and triphenyleno[1,2-b:4
这项研究表明,在催化量的Pd(PPh 3)4存在下,1,2-双(频哪醇硼基)烯烃和-芳烃与2,2'-二溴联芳基的双交叉偶联反应可以顺利进行。过量的碱可得到各种多环芳烃,例如菲,[5]螺旋烯,二硫代苯,三苯撑,二苯并[ g,p ],和三苯并[1,2- b:4,3- b ']二噻吩好到高产。值得注意的是,使用2,2'-二溴八氟联苯作为亲电试剂的环化反应提供了否则难以合成的八氟菲和半氟化二苯并[ g,p] chrysenes高产。
Syntheses of the five 9,9-Bis(n-butyl)dibenzostannoles are reported, which are each symmetrically disubstituted by two F3C-, CH3O-, (CH3)3C-substituents in the 3- and 6-positions or by two F3C- CH3O-substituents in the 2- and 7-positions of the benzo rings.
A mild, efficient electrochemical approach to the site-selective direct C-H amidation of benzene and its derivatives with acetonitrile and benzonitrile has been developed. It has been shown that joint electrochemical oxidation of various arenes in the presence of a copper salt as a catalyst and nitriles leads to the formation of N-phenylacetamide from benzene and N-benzylacetamides from benzyl derivatives
Organocatalytic C–H/C–H′ Cross-Biaryl Coupling: C-Selective Arylation of Sulfonanilides with Aromatic Hydrocarbons
作者:Motoki Ito、Hiroko Kubo、Itsuki Itani、Koji Morimoto、Toshifumi Dohi、Yasuyuki Kita
DOI:10.1021/ja407944p
日期:2013.9.25
The hypervalentiodine-mediated C-C selective coupling of N-methanesulfonyl anilides with aromatic hydrocarbons has been developed. The first organocatalytic oxidative cross-biaryl-coupling was achieved by the catalyst control in defining specific 2,2'-diiodobiphenyls for the direct C-C bond formations.
已开发出 N-甲磺酰苯胺与芳烃的高价碘介导的 CC 选择性偶联。第一个有机催化氧化交叉联芳偶联是通过催化剂控制来实现的,该控制定义了用于直接 CC 键形成的特定 2,2'-二碘联苯。