Low‐Temperature Intramolecular [4+2] Cycloaddition of Allenes with Arenes for the Synthesis of Diene Ligands
作者:Durga Prasad Hari、Guillaume Pisella、Matthew D. Wodrich、Artem V. Tsymbal、Farzaneh Fadaei Tirani、Rosario Scopelliti、Jerome Waser
DOI:10.1002/anie.202012299
日期:2021.3
The intramolecular [4+2] cycloaddition between arenes and allenes first reported by Himbert gives rapid access to rigid polycyclic scaffolds. Herein, we report a one‐pot oxyalkynylation/cycloaddition reaction proceeding under mild conditions (23–90 °C) and providing complex polycyclic architectures with high efficiency, and atom and step economy. The bicyclo[2.2.2]octadiene products were obtained with
Radical Cation Cyclopropanations via Chromium Photooxidative Catalysis
作者:Francisco J. Sarabia、Eric M. Ferreira
DOI:10.1021/acs.orglett.7b01095
日期:2017.6.2
The chromium photocatalyzed cyclopropanation of diazo reagents with electron-rich alkenes is described. The transformation occurs under mild conditions and features specific distinctions from traditional diazo-based cyclopropanations (e.g., avoiding β-hydride elimination, chemoselectivity considerations, etc.). The reaction appears to work most effectively using chromium catalysis, and a number of
[EN] ANTIMICROBIAL [3.1.0] BICYCLOHEXYLPHENYL-OXAZOLIDINONE DERIVATIVES AND ANALOGUES<br/>[FR] DERIVES DE [3.1.0] BICYCLOHEXYLPHENYL-OXAZOLIDINONE ANTIMICROBIENS ET LEURS ANALOGUES
申请人:UPJOHN CO
公开号:WO2004089943A1
公开(公告)日:2004-10-21
The present invention provides certain [3.1.0] bicyclic oxazolidinone derivatives of Formula (I) or pharmaceutically acceptable salts or prodrugs thereof that are antibacterial agents, pharmaceutical compositions containing them, methods for their use, and methods for preparing these compounds.
Stereoelectronic factors in bridgehead C–H bond insertion: studies toward the total synthesis of maoecrystal V
作者:Santa Jansone-Popova、Jeremy A. May
DOI:10.1016/j.tet.2016.03.101
日期:2016.6
A strategy for the totalsynthesis of maoecrystal V is presented. The key interior vicinal quaternary carbon centers will be formed via sequential bridgehead C–H bond insertion and enolate functionalization. Studies herein validate the C–H bond insertion as feasible in model studies, though there are significant effects on the selectivity for the bridgehead position from neighboring groups. Both inductive
Macrocycle Formation by Catalytic Intramolecular Cyclopropanation. A New General Methodology for the Synthesis of Macrolides
作者:Michael P. Doyle、Chad S. Peterson、Marina N. Protopopova、Alan B. Marnett、Dann L. Parker,、Doina G. Ene、Vincent Lynch
DOI:10.1021/ja971687z
日期:1997.9.1
Catalytic intramolecular cyclopropanation by diazoacetates onto a remote carbon−carbon double bond resulting in the formation of 9- to 20-membered ring lactones is reported. When competition exists between proximal allylic and remote olefinic cyclopropanation, macrocyclization is favored by catalysts of increasing electrophilicity: Rh2(pfb)4 > Rh2(OAc)4, Cu(MeCN)4PF6 > Rh(cap)4, and Cu(acac)2. Terpene