Palladium-Catalyzed Enantioselective α-Arylation of α-Fluoroketones
作者:Zhiwei Jiao、Jason J. Beiger、Yushu Jin、Shaozhong Ge、Jianrong Steve Zhou、John F. Hartwig
DOI:10.1021/jacs.6b09580
日期:2016.12.14
carbonyl compounds is a widely practiced method for C-C bondformation. Several enantioselective versions of this process have been reported, but intermolecular, enantioselective coupling reactions of aryl electrophiles with α-fluoro carbonyl compounds have yet to be disclosed. We report enantioselective coupling of aryl and heteroaryl bromides and triflates with α-fluoroindanones catalyzed by palladium
A simple, base-free preparation of S-aryl thioacetates as surrogates for aryl thiols
作者:Adri van den Hoogenband、Jos H.M. Lange、Raymond P.J. Bronger、Axel R. Stoit、Jan Willem Terpstra
DOI:10.1016/j.tetlet.2010.10.125
日期:2010.12
A mild method for the preparation of S-aryl thioacetates by hetero cross-coupling reactions of aryl bromides or aryl triflates with potassium thioacetate is described. The reaction proceeded smoothly in toluene at 110 °C, mediated by catalytic Pd2(dba)3 in combination with CyPF-tBu as the ligand. Neither the presence of a base nor microwave conditions were required. The formed S-aryl thioacetate proved
描述了通过芳基溴化物或芳基三氟甲磺酸酯与硫代乙酸钾酯的杂交联反应制备S-芳基硫代乙酸酯的温和方法。反应在110°C的甲苯中顺利进行,这是由催化性Pd 2(dba)3与CyPF- t Bu作为配体的结合介导的。既不需要存在碱也不需要微波条件。形成的S-芳基硫代乙酸酯证明在快速色谱条件下稳定,在温和的碱性条件下可以快速转化为相应的硫醇。
Intermolecular Mizoroki-Heck Reaction of Aliphatic Olefins with High Selectivity for Substitution at the Internal Position
作者:Liena Qin、Xinfeng Ren、Yunpeng Lu、Yongxin Li、Jianrong Steve Zhou
DOI:10.1002/anie.201201806
日期:2012.6.11
New ligand for old reaction: The title reaction of aryltriflates with aliphatic olefins leads to substitution at the internal position with high selectivity. The ratio of the desired isomer (shown in the scheme) to the sum of all other isomers is generally above 10:1. The key to success is the use of a ferrocene bisphosphine ligand (R= 1‐naphthyl). The reaction can be easily scaled up, and minor isomers
Arene CHO Hydrogen Bonding: A Stereocontrolling Tool in Palladium-Catalyzed Arylation and Vinylation of Ketones
作者:Zhiyan Huang、Li Hui Lim、Zuliang Chen、Yongxin Li、Feng Zhou、Haibin Su、Jianrong Steve Zhou
DOI:10.1002/anie.201300621
日期:2013.4.26
Weak is powerful: For the arylation of tin enolates, the palladium catalyst engages in weak CHOhydrogen bonds to control stereoselectivity (see scheme). Similar catalysts capable of NHOhydrogenbonding also works well.
Desymmetrization of cyclic olefins via asymmetric Heck reaction and hydroarylation
作者:Sijia Liu、Jianrong (Steve) Zhou
DOI:10.1039/c3cc47551d
日期:——
An asymmetric Heck reaction allows desymmetrization of substituted cyclic olefins in high dr and ee. A bisphosphine oxide is uniquely stereoselective for this purpose. Desymmetrization of bicyclic olefins via hydroarylation can also be realized in high ee.