Enantioselective Pd(II)-Catalyzed Intramolecular Oxidative 6-<i>endo</i> Aminoacetoxylation of Unactivated Alkenes
作者:Xiaoxu Qi、Chaohuang Chen、Chuanqi Hou、Liang Fu、Pinhong Chen、Guosheng Liu
DOI:10.1021/jacs.8b03767
日期:2018.6.20
A novel asymmetric 6-endo aminoacetoxylation of unactivatedalkenes by palladium catalysis, which yields chiral β-acetoxylated piperidines with excellent chemo-, regio- and enantioselectivities under very mild reaction conditions, has been established herein by employing a new designed pyridine-oxazoline (Pyox) ligand. Importantly, introducing a sterically bulky group into the C-6 position of Pyox
Palladium(II)‐Catalyzed Enantioselective Azidation of Unactivated Alkenes
作者:Xiaonan Li、Xiaoxu Qi、Chuanqi Hou、Pinhong Chen、Guosheng Liu
DOI:10.1002/anie.202006757
日期:2020.9.21
of unactivated alkenes has been established by using readily accessible 1‐azido‐1,2‐benziodoxol‐3(1H)‐one (ABX) as an azidating reagent, which affords a wide variety of structurally diverse 3‐N3‐substituted piperidines in good yields with excellent enantioselectivity. The reaction features good functional‐group compatibility and mild reaction conditions. Notably, both an electrophilic azidating reagent
Switchable Oxidative Reactions of <i>N</i>-allyl-2-Aminophenols: Palladium-Catalyzed Alkoxyacyloxylation vs an Intramolecular Diels–Alder Reaction
作者:Sabrina Giofrè、Manfred Keller、Leonardo Lo Presti、Egle M. Beccalli、Letizia Molteni
DOI:10.1021/acs.orglett.1c02539
日期:2021.10.15
The Pd(II)-catalyzed reaction of N-allyl-2-aminophenols in the presence of PhI(OCOR)2 as the oxidant resulted in an alkoxyacyloxylation process, with the formation of functionalized dihydro-1,4-benzoxazines. The reaction performed in the absence of palladium catalyst switched to an intramolecular Diels–Alder reaction (IMDA) pathway, which was the result of an oxidative dearomatization of the 2-aminophenol
Chiral cyclometalation of 6-(1-phenylbenzyl)-2,2′-bipyridine
作者:Sergio Stoccoro、Luca Maidich、Tiziana Ruiu、Maria Agostina Cinellu、Guy James Clarkson、Antonio Zucca
DOI:10.1039/c5dt02483h
日期:——
the corresponding substituted pyridine. The coordinating properties of the new ligand have been tested with two d8 metal ions, Pt(II) and Pd(II), to give the cyclometalated complexes [Pt(N,N,C)Cl] and [Pd(N,N,C)Cl], where N,N,C is a terdentate deprotonated bipyridine containing a new stereogenic carbon atom directly generated by C–H bond activation. The single-crystal of the platinum complex has been
The factors affecting the palladium-catalyzed synthesis of chiral α-chloromethylene-γ-butyrolactone were investigated. The combined effect of ligand, additive and N-Chlorophthalimide (NCP) is an important factor for the yield and ee value of this reaction. The method has good generalizability.