Synthesis of 3-Arylpiperidines by a Radical 1,4-Aryl Migration
作者:Alexandru Gheorghe、Béatrice Quiclet-Sire、Xavier Vila、Samir Z. Zard
DOI:10.1021/ol0503642
日期:2005.4.14
[reaction: see text] A route to 3-arylpiperidines, 3-arylpyridines, and 5-arylpiperidin-2-ones involving a radical 1,4-aryl migration has been explored. The sequence requires a xanthate addition to an N-allylarylsulfonamide, followed by acetylation and treatment with dilauroyl peroxide to give the 1,4-aryl transfer product, which upon acidic hydrolysis affords the desired piperidine derivative.
Synthesis of substituted 3-arylpiperidines and 3-arylpyrrolidines by radical 1,4 and 1,2-aryl migrations
作者:Alexandru Gheorghe、Béatrice Quiclet-Sire、Xavier Vila、Samir Z. Zard
DOI:10.1016/j.tet.2007.04.091
日期:2007.7
A route to 3-arylpiperidines and 3-arylpyrrolidines involving radical 1,4- and 1,2-aryl migrations has been explored. For the piperidines, the first route requires a xanthate addition to an N-allylarylsulfonamide, followed by acetylation and treatment with lauroyl peroxide to give the corresponding 1,4-aryl transfer product. This compound can be converted into the desired piperidine derivative following
Radical Fragment Coupling Route to Geminal Bis(boronates)
作者:Qi Huang、Samir Z. Zard
DOI:10.1021/acs.orglett.8b02235
日期:2018.9.7
atom abstraction and delivers a vast array of highly functional geminal bis(boronates). The ability to assemble geminal bis(boronates) bearing polar functional groups not readily obtained through existing methods is particularly noteworthy. This approach also opens up access to geminal bis(boronyl) cyclopropanes and geminal bis(boronyl) tetrahydroquinolines.
Novel Route to Triethylsilyl-Substituted Cyclopropanes
作者:Shi-Guang Li、Samir Z. Zard
DOI:10.1021/ol503081b
日期:2014.12.5
Radical adducts of S-α-ketonyl dithiocarbonates (xanthates) to triethyl vinylsilane are converted into triethylsilyl-substituted cyclopropanes upon ozonolysis followed by exposure to 1,4-dibromobutane and Cs2CO3/18-crown-6 in refluxing acetonitrile. The sequence works best with phenacyl type adducts, and the use of the less bulky trimethysilyl (TMS) derivatives results in extensive desilylation.
S -α-酮基二硫代碳酸酯(黄原酸酯)与三乙基乙烯基硅烷的自由基加合物在臭氧分解后转化为三乙基甲硅烷基取代的环丙烷,然后在回流的乙腈中暴露于1,4-二溴丁烷和Cs 2 CO 3 / 18-crown-6。该序列最适用于苯甲酰基型加合物,使用体积较小的三甲基甲硅烷基(TMS)衍生物会导致大量的甲硅烷基化。
A new synthesis of pyrroles
作者:Béatrice Quiclet-Sire、Frédérique Wendeborn (née Bertrand)、Samir Z. Zard
DOI:10.1039/b207061h
日期:——
The radical reaction between an N-ethylsulfonylenamide and an α-xanthyl ketone gives an intermediate γ-keto imine which spontaneously ring-closes to the pyrrole.