The Trepobatinae (Gerridae) of New Guinea and surrounding regions, with a review of the world fauna. Part 6. Phylogeny, biogeography, world checklist, bibliography and final taxonomic addenda
Synthesis of Esters by in Situ Formation and Trapping of Diazoalkanes
作者:Richard A. Squitieri、Galen P. Shearn-Nance、Jason E. Hein、Jared T. Shaw
DOI:10.1021/acs.joc.6b00408
日期:2016.7.1
method has been developed for the in situ formation and trapping of diazoalkanes by carboxylic acids to form esters. The method is applicable to a large variety of carboxylic acids using diazo compounds that are formed from the hydrazones of benzaldehydes and aryl ketones. In situ reaction monitoring with IR spectroscopy (ReactIR) was used to demonstrate that slow addition of the hydrazone to a mixture
Benzylic-acetoxylation of alkylbenzenes with PhI(OAc)2 in the presence of catalytic amounts of TsNH2 and I2
作者:Haruka Baba、Katsuhiko Moriyama、Hideo Togo
DOI:10.1016/j.tetlet.2011.06.036
日期:2011.8
Treatment of alkylbenzenes with (diacetoxyiodo)benzene in the presence of catalytic amounts of p-toluenesulfonamide or p-nitrobenzenesulfonamide, and molecular iodine in 1,2-dichloroethane at 60 °C gave the corresponding (α-acetoxy)alkylbenzenes in good to moderate yields. The present reaction is a simple method for the introduction of an acetoxy group to the benzylic position of alkylbenzenes.
Benzylic C–H Esterification with Limiting C–H Substrate Enabled by Photochemical Redox Buffering of the Cu Catalyst
作者:Dung L. Golden、Chaofeng Zhang、Si-Jie Chen、Aristidis Vasilopoulos、Ilia A. Guzei、Shannon S. Stahl
DOI:10.1021/jacs.3c01662
日期:2023.5.3
Copper-catalyzed radical-relay reactions provide a versatile strategy for selective C–H functionalization; however, reactions with peroxide-based oxidants often require excess C–H substrate. Here, we report a photochemical strategy to overcome this limitation by using a Cu/2,2′-biquinoline catalyst that supports benzylic C–H esterification with limiting C–H substrate. Mechanistic studies indicate that
铜催化的自由基中继反应为选择性 C-H 官能化提供了一种通用策略;然而,与过氧化物基氧化剂的反应通常需要过量的 C-H 底物。在这里,我们报告了一种光化学策略,通过使用 Cu/2,2'-联喹啉催化剂来克服这一限制,该催化剂支持限制 C-H 底物的苄基 C-H 酯化反应。机理研究表明,蓝光照射促进羧酸盐到铜的电荷转移,将静止态 Cu II还原为 Cu I,从而激活过氧化物以生成烷氧基自由基氢原子转移物质。这种“光化学氧化还原缓冲”引入了一种独特的策略来维持自由基接力反应中铜催化剂的活性。
Synthetic Electrochemistry Enabled Esterification via Oxidative Mesolytic Cleavage of Alkoxyamines
Stable benzylic carbocations were generated via mesolytic cleavage of TEMPO-derived alkoxyamines, which was realized by electrochemicaloxidation. This strategy provided an efficient and unique approach to access stabilized carbocations under mild conditions. Esterification of benzylic carbocations using carboxylic acid produced a variety of benzylic esters with a broad substrate scope and excellent
稳定的苄基碳阳离子是通过 TEMPO 衍生的烷氧基胺的介观裂解产生的,这是通过电化学氧化实现的。该策略提供了一种在温和条件下获得稳定碳正离子的有效且独特的方法。使用羧酸酯化苄基碳正离子可产生多种具有广泛底物范围和优异官能团相容性的苄酯。