Electrochemical Oxidative Aryl(alkyl)trifluoromethylation of Allyl Alcohols via 1,2-Migration
作者:Zhipeng Guan、Huamin Wang、Yange Huang、Yunkun Wang、Shengchun Wang、Aiwen Lei
DOI:10.1021/acs.orglett.9b01518
日期:2019.6.21
An electrochemical oxidative difunctionalization of allyl alcohols for the synthesis of β-trifluoromethyl ketones is achieved through a 1,2-migration process. A series of β-trifluoromethyl ketones can be facilely obtained utilizing CF3SO2Na as a radical source, eliminating the use of metals and sacrificial chemical oxidants. Importantly, this protocol not only realizes aryl migration but also offers
通过1,2-迁移过程可实现烯丙醇的电化学氧化双官能化,以合成β-三氟甲基酮。利用CF 3 SO 2 Na作为自由基源可以轻松获得一系列β-三氟甲基酮,而无需使用金属和牺牲性化学氧化剂。重要的是,该协议不仅实现了芳基迁移,而且还提供了烷基迁移产物。另外,电化学催化的环膨胀和克级反应证明了该方案的合成有用性。
Gold(I)-Catalysed Direct Thioetherifications Using Allylic Alcohols: an Experimental and Computational Study
作者:Lorena Herkert、Samantha L. J. Green、Graeme Barker、David G. Johnson、Paul C. Young、Stuart A. Macgregor、Ai-Lan Lee
DOI:10.1002/chem.201403293
日期:2014.9.1
A gold(I)‐catalysed directthioetherification reaction between allylicalcohols and thiols is presented. The reaction is generally highly regioselective (SN2′). This dehydrative allylation procedure is very mild and atom economical, producing only water as the by‐product and avoiding any unnecessary waste/steps associated with installing a leaving or activating group on the substrate. Computational
提出了金(I)催化烯丙醇和硫醇之间的直接硫醚化反应。该反应通常具有高度区域选择性(S N 2')。这种脱水烯丙基化过程非常温和且原子经济,仅产生水作为副产物,并避免与在底物上安装离去或活化基团相关的任何不必要的浪费/步骤。提出计算研究以深入了解反应机制。计算表明,区域选择性处于平衡控制之下,并且最终由产物的热力学稳定性决定。
Indium Versus Gold Catalysis in Dehydrative Reactions with Allylic Alcohols
complexes as a catalyst in dehydrative reactions with allylic alcohols. There is often an improvement in yield and, in particular, indium(III) chloride outperforms gold(I) as a catalyst in chemoselective reactions. For example, substrates with pendent alkyne or alkene groups react poorly under gold(I) catalysis, but are better tolerated under indium(III) chloride catalysis.
A Surprising Substituent Effect Provides a Superior Boronic Acid Catalyst for Mild and Metal-Free Direct Friedel-Crafts Alkylations and Prenylations of Neutral Arenes
作者:Carolynne L. Ricardo、Xiaobin Mo、J. Adam McCubbin、Dennis G. Hall
DOI:10.1002/chem.201500020
日期:2015.3.9
for Friedel–Crafts alkylations is an important objective of interest toward the production of pharmaceuticals and commodity chemicals. Herein, 2,3,4,5‐tetrafluorophenylboronic acid was identified as a potent air‐ and moisture‐tolerant metal‐free catalyst that significantly improves the scope of direct Friedel–Crafts alkylations of a variety of slightly activated and neutral arenes, including polyarenes
Gold(I)-catalysed one-pot synthesis of chromans using allylic alcohols and phenols
作者:Eloi Coutant、Paul C Young、Graeme Barker、Ai-Lan Lee
DOI:10.3762/bjoc.9.209
日期:——
A gold(I)-catalysed reaction of allylicalcohols and phenols produces chromans regioselectively via a one-pot Friedel-Crafts allylation/intramolecular hydroalkoxylation sequence. The reaction is mild, practical and tolerant of a wide variety of substituents on the phenol.