By the use of 1-chloro-1,2-benziodoxol-3-one, an age-old reagent, the practical and efficient chlorination method is achieved. This hypervalent iodine reagent is amenable not only to the chlorination of nitrogen-containing heterocycles but also to selected classes of arenes, BODIPY dyes, and pharmaceuticals. In addition, the advantages, such as easy preparation and recyclable, air- and moisture-stable
A Chlorinating Reagent: N-chloro-N-methoxybenzene Sulfonamide
作者:Xiaoqiu Pu、Qingwei Li、Zehai Lu、Xianjin Yang
DOI:10.1002/ejoc.201601226
日期:2016.11
Abstract: A structurally simple and reactive chlorinatingreagent,N-chloro-N-methoxybenzenesulfonamide, was conveniently and economically prepared in high yield. 1,3-Diketones, β-keto esters, benzoyl trifluoroacetones, phenols, anisoles, heteroarenes andaromatic amines were chlorinated with it, obtaining chlorinated products in good to high yields.
Amplification of Trichloroisocyanuric Acid (TCCA) Reactivity for Chlorination of Arenes and Heteroarenes via Catalytic Organic Dye Activation
作者:David A. Rogers、Adam T. Bensalah、Alvaro Tomas Espinosa、John L. Hoerr、Fares H. Refai、Amy K. Pitzel、Juan J. Alvarado、Angus A. Lamar
DOI:10.1021/acs.orglett.9b01414
日期:2019.6.7
electron-withdrawing groups are chlorinated in good to excellent yields (scalable to gram scale) using trichloroisocyanuricacid (TCCA) and catalytic Brilliant Green (BG). Visible-light activation of BG serves to amplify the electrophilic nature of TCCA, providing a mild alternative approach to acid-promoted chlorination of deactivated (hetero)aromatic substrates. The utility of the TCCA/BG system is demonstrated
Palau’chlor: A Practical and Reactive Chlorinating Reagent
作者:Rodrigo A. Rodriguez、Chung-Mao Pan、Yuki Yabe、Yu Kawamata、Martin D. Eastgate、Phil S. Baran
DOI:10.1021/ja5031744
日期:2014.5.14
Unlike its other halogen atom siblings, the utility of chlorinated arenes and (hetero)arenes are twofold: they are useful in tuning electronic structure as well as acting as points for diversification via cross-coupling. Herein we report the invention of a new guanidine-based chlorinating reagent, CBMG or "Palau'chlor", inspired by a key chlorospirocyclization en route to pyrrole imidazole alkaloids. This direct, mild, operationally simple, and safe chlorinating method is compatible with a range of nitrogen-containing heterocycles as well as select classes of arenes, conjugated pi-systems, sulfonamides, and silyl enol ethers. Comparisons with other known chlorinating reagents revealed CBMG to be the premier reagent.