<i>N</i>
,
<i>N</i>
‐Dialkylhydrazones as Versatile Umpolung Reagents in Enantioselective Anion‐Binding Catalysis
作者:Melania Gómez‐Martínez、María Carmen Pérez‐Aguilar、Dariusz G. Piekarski、Constantin G. Daniliuc、Olga García Mancheño
DOI:10.1002/anie.202013380
日期:2021.3
ion‐pair complex was envisioned. The formation of such a network was further supported by both experimental and computationalstudies, which showed the crucial role of the anion as a template unit. The asymmetric Reissert‐type reaction of quinolines as a model test reaction chemoselectively delivered highly enantiomerically enriched hydrazones (up 95:5 e.r.) that could be further derivatized to value‐added
Enantioselective Conjugate Addition of <i>N</i>,<i>N</i>-Dialkylhydrazones to α-Hydroxy Enones
作者:David Monge、Eloísa Martín-Zamora、Juan Vázquez、Manuel Alcarazo、Eleuterio Álvarez、Rosario Fernández、José M. Lassaletta
DOI:10.1021/ol071055+
日期:2007.7.1
The activation of alpha-hydroxy enones by the Zn(OTf)2/tBuBOX catalyst enables the enantioselectiveconjugateaddition of 1-methyleneaminopyrrolidine as a neutral d1 synthon. Experimental evidence supports a stereochemical model where a triflate ligand controls the geometry of the catalyst-substrate complex by means of a OH-OTf hydrogen bond. The synthesis of beta-cyano acids illustrates the potential