Bringing “N” into the game: The direct chemoselective nitrogenation of unactivated alkenes can be achieved through oxidative selenium catalysis (see scheme). This method provides a broad variety of allylic imides in yields of up to 89 % using N‐fluorobenzenesulfonimide (NFSI) as the terminal oxidant and nitrogen source. Furthermore, an unprecedented selenium‐catalyzed vinylic C(sp2)–H nitrogenation
A Diastereoselective Total Synthesis of <i>trans</i>-Trikentrin A: A Ring Contraction Approach
作者:Luiz F. Silva、Marcus V. Craveiro
DOI:10.1021/ol8023105
日期:2008.12.4
obtain the polyalkylated indole (+/-)-trans-trikentrin A was developed. The synthesis of this natural alkaloid features a thallium(III)-mediated ring contraction reaction to obtain the trans-1,3-disubstituted five-membered ring in a diastereoselective manner. Thallium(III) is chemoselective in this rearrangement, reacting with the olefin without oxidation of the indolemoiety. Other key transformations
Metal-Free Asymmetric Synthesis of Indanes through Chiral Hypervalent Iodine(III)-Mediated Ring Contraction
作者:Anees Ahmad、Luiz F. Silva
DOI:10.1021/acs.joc.5b02803
日期:2016.3.4
The iodine(III)-mediated asymmetric oxidative rearrangement of 1,2-dihydronaphthalenes was investigated to prepare optically active 1-substituted indanes. The chiral hypervalent iodine species is generated in situ from a chiral aryl iodide, prepared in 94% yield in one step. This metal-free protocol was applied to different cyclic alkenes, substituted with oxygen, with nitrogen, or at position 1 with
Iodine(III)-Promoted Ring Contraction of 1,2-Dihydronaphthalenes: A Diastereoselective Total Synthesis of (±)-Indatraline
作者:Luiz F. Silva,、Fernanda A. Siqueira、Eliane C. Pedrozo、Fabiana Y. M. Vieira、Antônio C. Doriguetto
DOI:10.1021/ol070027o
日期:2007.4.1
[reaction: see text] A new approach for the synthesis of (+/-)-indatraline, which is a 3-phenyl-1-indanamine that displays several biological activities, is described. The strategy features as the key step a diastereoselective ring contraction of a 1,2-dihydronaphthalene promoted by PhI(OTs)OH, to construct the indan ring system. The oxidative rearrangement of other 1,2-dihydronaphthalenes was also investigated