Free radical-mediated carboxylation by radical reaction of alkyl iodides with methyl oxalyl chloride
作者:Sunggak Kim、Sang Yong Jon
DOI:10.1016/s0040-4039(98)01568-8
日期:1998.10
Free radical-mediated carboxylation is achieved by treatment of alkyl iodides with methyl oxalyl chloride and bis(tributyltin) in benzene at 350 nm to afford the corresponding acid chlorides as a major product along with a small amount of the methyl esters.
A general N-alkylation platform via copper metallaphotoredox and silyl radical activation of alkyl halides
作者:Nathan W. Dow、Albert Cabré、David W.C. MacMillan
DOI:10.1016/j.chempr.2021.05.005
日期:2021.7
The catalytic union of amides, sulfonamides, anilines, imines, or N-heterocycles with a broad spectrum of electronically and sterically diverse alkyl bromides has been achieved via a visible-light-induced metallaphotoredox platform. The use of a halogen abstraction-radical capture (HARC) mechanism allows for room temperature coupling of C(sp3)-bromides using simple Cu(II) salts, effectively bypassing
通过可见光诱导的金属光氧化还原平台实现了酰胺、磺胺、苯胺、亚胺或N-杂环与广谱电子和空间多样化烷基溴的催化结合。卤素提取-自由基捕获 (HARC) 机制的使用允许使用简单的 Cu(II) 盐在室温下耦合 C( sp 3 )-溴化物,有效绕过通常与热诱导 S N 2 或 S相关的过高障碍N 1 N-烷基化。这种区域和化学选择性方案与 >10 类药物相关的N兼容- 亲核试剂,包括已建立的药剂,以及结构多样的伯、仲和叔烷基溴。此外,通过将N-亲核试剂与环丙基溴和未活化的烷基氯(与亲核取代途径不相容的底物)结合,突出了 HARC 方法与传统惰性偶联伙伴结合的能力。初步的机械实验验证了该平台的双重催化、开壳性质,这使得在传统的基于卤化物的N-烷基化系统中无法实现的反应性成为可能。
Triphenylphosphine-Catalyzed Alkylative Iododecarboxylation with Lithium Iodide under Visible Light
作者:Ming-Chen Fu、Jia-Xin Wang、Rui Shang
DOI:10.1021/acs.orglett.0c03173
日期:2020.11.6
light-emitting diodes, PPh3 catalyzes the iododecarboxylation of aliphatic carboxylic acid derived N-(acyloxy)phthalimide with lithiumiodide as an iodine source. The reaction delivers primary, secondary, and bridgehead tertiary alkyl iodides in acetone solvent, and the alkyl iodide products were easily used to generate C–N, C–O, C–F, and C–S bonds to allow various decarboxylative transformations without
A mild and highly chemoselective iodination of alcohol using polymer supported DMAP
作者:DIPARJUN DAS、JASHA MOMO H ANAL、LALTHAZUALA ROKHUM
DOI:10.1007/s12039-016-1158-1
日期:2016.11
supported DMAP is used in catalytic amount and is recovered and reused several times. Additionally, this method is highly chemoselective. A mild and highly selective iodination of alcohols using polymer supported 4-(Dimethylamino)pyridine (DMAP) in catalytic amount is reported. The basecatalyst can be easily recovered by simple filtration and reused several times without appreciable loss in activity.
Cu‐Catalyzed Hydroxymethylation of Unactivated Alkyl Iodides with CO To Provide One‐Carbon‐Extended Alcohols
作者:Siling Zhao、Neal P. Mankad
DOI:10.1002/anie.201801814
日期:2018.5.14
We have developed a reductive carbonylation method by which unactivated alkyliodides can be hydroxymethylated to provide one‐carbon‐extended alcohol products under Cu‐catalyzed conditions. The method is tolerant of alkyl β‐hydrogen atoms, is robust towards a wide variety of functional groups, and was applied to primary, secondary, and tertiary alkyliodide substrates. Mechanistic experiments indicate