Palladium-Catalyzed Defluorinative Coupling of 1-Aryl-2,2-Difluoroalkenes and Boronic Acids: Stereoselective Synthesis of Monofluorostilbenes
作者:Richard T. Thornbury、F. Dean Toste
DOI:10.1002/anie.201605651
日期:2016.9.12
The palladium‐catalyzed defluorinative coupling of 1‐aryl‐2,2‐difluoroalkenes with boronic acids is described. Broad functional‐group tolerance arises from a redox‐neutral process by a palladium(II) active species which is proposed to undergo a β‐fluoride elimination to afford the products. The monofluorostilbene products were formed with excellent diastereoselectivity (≥50:1) in all cases, and it
描述了钯催化的 1-芳基-2,2-二氟烯烃与硼酸的脱氟偶联。广泛的官能团耐受性源自钯 (II) 活性物质的氧化还原中性过程,建议进行 β-氟化物消除以提供产品。在所有情况下,所形成的单氟二苯乙烯产品都具有优异的非对映选择性(≥50:1),这一点至关重要,因为传统的色谱技术通常无法分离单氟烯烃异构体。为了证明该方法的反应性和官能团耐受性的独特组合,使用单氟芪作为酰胺等排物合成了 Gleevec® 类似物。
A general preparation of (Z)-1-fluorostilbene derivatives for the design of conformationally restricted peptidomimetics
作者:David R. Williams、Micheal W. Fultz、Thomas E. Christos、Jeffery S. Carter
DOI:10.1016/j.tetlet.2009.10.099
日期:2010.1
The preparation of (Z)-1-fluoro-2-bromostyrenes provides a general route for the formation of (Z)-1-fluorostilbene derivatives as configurationally stable spacial linkers for the design of conformationally restricted peptidomimetics. Palladium-catalyzed aryl Suzuki and Stille cross-coupling reactions have been surveyed to proceed with complete retention of fluoroalkene geometry, and permit the direct incorporation of a variety of aryl and heteroaromatic substituents. (C) 2009 Elsevier Ltd. All rights reserved.