Asymmetric Cascade Reaction to Allylic Sulfonamides from Allylic Alcohols by Palladium(II)/Base-Catalyzed Rearrangement of Allylic Carbamates
作者:Johannes Moritz Bauer、Wolfgang Frey、René Peters
DOI:10.1002/anie.201403090
日期:2014.7.14
accessible achiral allylic alcohols into chiral sulfonyl‐protected allylic amines. The reaction is catalyzed by the cooperative action of a chiral ferrocene palladacycle and a tertiary amine base and combines high step‐economy with operational simplicity (e.g. no need for inert‐gas atmosphere or catalyst activation). Mechanistic studies support a PdII‐catalyzed [3,3] rearrangement of allylic carbamates—generated
Dormant versus Evolving Aminopalladated Intermediates: Toward a Unified Mechanistic Scenario in Pd<sup>II</sup>-Catalyzed Aminations
作者:Jamshid Rajabi、Mélanie M. Lorion、Vu Linh Ly、Frédéric Liron、Julie Oble、Guillaume Prestat、Giovanni Poli
DOI:10.1002/chem.201302744
日期:2014.2.3
PdII‐catalyzed alkene aminopalladation and allylic CH activation are two competing reaction sequences sharing the same reaction conditions. This study aimed at understanding the factors that bias one or the other path in the intramolecular oxidative cyclization of two types of N‐tosyl amidoalkenes. The results obtained are in accord with the initial generation of a high‐energy cyclic (5‐ or 6‐membered)
Dual Palladium(II)/Tertiary Amine Catalysis for Asymmetric Regioselective Rearrangements of Allylic Carbamates
作者:Johannes Moritz Bauer、Wolfgang Frey、René Peters
DOI:10.1002/chem.201600138
日期:2016.4.11
access to enantiopure allylicamines as valuable precursors towards chiral β‐ and γ‐aminoalcohols as well as α‐ and β‐aminoacids is desirable for industrial purposes. In this article an enantioselective method is described that transforms achiral allylic alcohols and N‐tosylisocyanate in a single step into highly enantioenriched N‐tosyl protected allylicamines via an allylic carbamate intermediate