Palladium-Catalyzed Cascade sp<sup>2</sup> C–H Bond Functionalizations Allowing One-Pot Access to 4-Aryl-1,2,3,4-tetrahydroquinolines from <i>N</i>-Allyl-<i>N</i>-arylsulfonamides
palladium-catalyzed cascade reaction allowing an efficient synthesis of 4-aryl-1,2,3,4-tetrahydroquinolines from N-allyl-N-arylsulfonamides and benzenesulfonylchlorides. In this transformation, two C(sp2)–C(sp3) bonds were formed via activation of C(sp2)–H bonds. The reaction proceeds using the easily accessible catalyst PdCl2, with Li2CO3 as inexpensive base and CuBr as additive, and tolerates a wide variety of substituents
我们已经开发了钯催化的级联反应,可以从N-烯丙基-N-芳基磺酰胺和苯磺酰氯有效合成4-芳基-1,2,3,4-四氢喹啉。在此转换中,通过激活C(sp 2)-H键形成了两个C(sp 2)-C(sp 3)键。该反应使用容易获得的催化剂PdCl 2进行,其中Li 2 CO 3为廉价的碱,CuBr为添加剂,并且在两个反应伙伴上都可以耐受多种取代基。
Nitro-Power! An exceptionally general electrophilicamination of zinc organyl compounds was developed, and yields alkylated aromatic aminoboranes from commercially available nitroarenes. The partially reduced nitro group is directly engaged as an electrophilic nitrogen intermediate. The aminoboranes were reacted with electrophiles, thereby incorporating two different substituents at the N atom of the
作者:Alastair A. Cant、Guillaume H. V. Bertrand、Jaclyn L. Henderson、Lee Roberts、Michael F. Greaney
DOI:10.1002/anie.200901410
日期:2009.6.29
Adding an aryne to a tertiary allylamine affords o‐allylaniline products of an aza‐Claisenrearrangement. The aryne simultaneously provides the π component for the rearrangement and the quaternization event that lowers the activation energy for the sigmatropic shift. The reaction was applied to the synthesis of medium‐ring benzannulated amines (see scheme).
Catalyst-Free [2,3]-Sigmatropic Rearrangement Reactions of Photochemically Generated Ammonium Ylides
作者:Fang Li、Feifei He、Rene M. Koenigs
DOI:10.1055/s-0037-1610732
日期:2019.12
rearrangement reaction of ammoniumylides furnishes valuable α,α-disubstituted amino esters. In this work, we describe the visible-light photolysis reaction of aryldiazoacetates in the presence of tertiary amines that react via a free ammoniumylide in a sigmatropic rearrangement reaction to provide amino esters in moderate to very good yields (33 examples, up to 97% yield). The rearrangement reaction of ammonium
Sequential Oxidative α-Cyanation/Anti-Markovnikov Hydroalkoxylation of Allylamines
作者:Alexander Wagner、Nathalie Hampel、Hendrik Zipse、Armin R. Ofial
DOI:10.1021/acs.orglett.5b02319
日期:2015.10.2
Iron-catalyzed oxidative α-cyanations at tertiary allylamines in the allylic position are followed by anti-Markovnikov additions of alcohols across the vinylic CC double bonds of the initially generated α-aminonitriles. These consecutive reactions generate 2-amino-4-alkoxybutanenitriles from three reactants (allylamines, trimethylsilyl cyanide, and alcohols) in one reaction vessel at ambient temperature