Metal-Free Synthesis of Oxazolidine-2,4-diones and 3,3-Disubstituted Oxindoles via ICl-Induced Cyclization
作者:Wei Yi、Xing-Xiao Fang、Qing-Yun Liu、Gong-Qing Liu
DOI:10.1002/ejoc.201801250
日期:2018.12.19
A metal‐free method for the construction of oxazolidine‐2,4‐diones and oxindoles is reported herein. The resulting products can be used as key intermediates in synthesis of bioactive compounds such as toloxatone, (±)‐esermethole, and (±)‐physostigmine.
An efficient iodocarbocyclization of alkenes for the synthesis of iodooxindoles has been developed. This reaction proceeds in a chemoselective manner and shows excellent tolerance of various functional groups, including a chemosensitive hydroxymethyl group. Nonmetal inorganic iodine pentoxide was used as both the oxidant and iodine source, making this protocol very practical. On the basis of experimental
Pd(0)/Blue Light Promoted Carboiodination Reaction – Evidence for Reversible C–I Bond Formation via a Radical Pathway
作者:Austin D. Marchese、Andrew G. Durant、Cian M. Reid、Clara Jans、Ramon Arora、Mark Lautens
DOI:10.1021/jacs.2c09716
日期:2022.11.16
A Pd(0)/blue light catalyzed carboiodination reaction is reported. A simple, air-stable catalytic system, utilizing [Pd(allyl)Cl]2 and DPEPhos, generated a variety of iodinated hetero- and carbocycles including oxindoles, dihydrobenzofurans, indolines, a chromane, and a tetrahydronaphthalene. This protocol was tolerant of sensitive functional groups including free carboxylic acids, phenols, and anilines
Cyclisative carbo-iodination of N-alkyl-N-arylacrylamide derivatives (3) in the presence of PhI(OAc)(2)/I-2 afforded functionalized 3-(iodomethyl)-3-substituted-indolin-2-ones (4) in good to excellent yields. With a suitably functionalized linear amide, spirooxindole 8 was prepared in a one-pot fashion via a sequence of iodo-arylation followed by an in situ base-promoted intramolecular S(N)2 reaction.