Allylic Etherification via Ir(I)/Zn(II) Bimetallic Catalysis
作者:Justin P. Roberts、Chulbom Lee
DOI:10.1021/ol0508328
日期:2005.6.1
[reaction: see text] An efficient allylic etherification of aliphatic alcohols with allylic carbonates has been achieved by an iridium catalysis using stoichiometric zinc alkoxides or a two-component bimetallic catalytic system where the Ir(I) catalyst acts on allylic carbonates to generate electrophiles while aliphatic alcohols are separately activated by Zn(II) coordination to function as nucleophilies
Assembly of Terpenoid Cores by a Simple, Tunable Strategy
作者:Ouidad Lahtigui、Fabien Emmetiere、Wei Zhang、Liban Jirmo、Samira Toledo-Roy、John C. Hershberger、Jocelyn M. Macho、Alexander J. Grenning
DOI:10.1002/anie.201608863
日期:2016.12.19
Oxygenated, polycyclic terpenoid natural products have important biological activities. Although total synthesis of such terpenes is widely studied, synthetic strategies that allow for controlled placement of oxygen atoms and other functionality remains a challenge. Herein, we present a simple, scalable, and tunable synthetic strategy to assemble terpenoid‐like polycycloalkanes from cycloalkanones
nonstabilized carbon nucleophiles, was successfully used for the first time in the palladium-catalyzedasymmetricallylicalkylation reaction, affording the corresponding allylic alkylated products in high yields with high enantioselectivities. The usefulness of the protocol has been demonstrated by the enantioselective synthesis of an important chiral building block and enantiomer of Dubiusamine A.
Palladium catalyzed cascade umpolung allylation/acetalation for the construction of quaternary 3-amino oxindoles
作者:Xi-Shang Sun、Xin Chang、Li-Min Shi、Zuo-Fei Wang、Liang Wei、Chun-Jiang Wang
DOI:10.1039/d1cc03075b
日期:——
Herein we reported a highly diastereoselective synthesis of quaternary 3-amino oxindoles bearing an acetal unit via a palladiumcatalyzed three-component cascade umpolung allylation/acetalation process. An array of 3-amino 3-allyl oxindoles incorporating diversified functional groups were prepared in good yields with exclusive diastereoselectivities. Further investigation demonstrated that the current
A catalytic asymmetric allylic alkylation reaction of 3‐aryloxindoles was accomplished via a dual catalysis merging palladium catalysis and asymmetric H‐bonding catalysis for the first time. Using this approach, allylated oxindoles bearing chiral all‐carbon quaternary centers were produced in high yields with good enantioselectivities (up to 92 % yield and 96:4 er).