Mild and Rapid Pd-Catalyzed Cross-Coupling with Hydrazine in Continuous Flow: Application to the Synthesis of Functionalized Heterocycles
作者:Andrew DeAngelis、Dong-Hui Wang、Stephen L. Buchwald
DOI:10.1002/anie.201208544
日期:2013.3.18
CN cross‐coupling of aryl chlorides with hydrazine is described. Through the use of continuousflow, the hazards associated with the use of hydrazine in the presence of transition metals are decreased. In addition, multistep flow sequences have also been developed for the generation of functionalizedheterocycles utilizing the arylhydrazine intermediates.
Palladium-Catalyzed Cross-Coupling of Aryl Chlorides and Tosylates with Hydrazine
作者:Rylan J. Lundgren、Mark Stradiotto
DOI:10.1002/anie.201003764
日期:2010.11.8
Hydrazine is not a problem anymore: The title transformation is the first reaction to yield aryl hydrazines through the cross‐coupling of aryl chlorides and tosylates with hydrazine. An appropriately designed palladium catalyst allows this reaction to proceed rapidly under mild conditions, and with excellent chemoselectivity (see scheme; Ad=adamantyl, Ts=4‐toluenesulfonyl).
肼不再是问题:标题转化是通过芳基氯化物和甲苯磺酸与甲苯磺酸酯的交叉偶联反应生成芳基肼的第一个反应。适当设计的钯催化剂可使该反应在温和条件下快速进行,并具有出色的化学选择性(参见方案; Ad =金刚烷基,Ts = 4-甲苯磺酰基)。
Diversification of edaravone via palladium-catalyzed hydrazine cross-coupling: Applications against protein misfolding and oligomerization of beta-amyloid
作者:Mark A. MacLean、Elena Diez-Cecilia、Christopher B. Lavery、Mark A. Reed、Yanfei Wang、Donald F. Weaver、Mark Stradiotto
DOI:10.1016/j.bmcl.2015.11.022
日期:2016.1
N-Aryl derivatives of edaravone were identified as potentially effective small molecule inhibitors of tau and beta-amyloid aggregation in the context of developing disease-modifying therapeutics for Alzheimer's disease (AD). Palladium-catalyzed hydrazine monoarylation protocols were then employed as an expedient means of preparing a focused library of 21 edaravone derivatives featuring varied N-aryl substitution, thereby enabling structure-activity relationship (SAR) studies. On the basis of data obtained from two functional biochemical assays examining the effect of edaravone derivatives on both fibril and oligomer formation, it was determined that derivatives featuring an N-biaryl motif were four-fold more potent than edaravone. (C) 2015 Elsevier Ltd. All rights reserved.