A RhIII‐catalyzed intramolecularoxidative cross‐coupling between double bonds for the synthesis of macrolides is described. Under the optimized reaction conditions, macrocycles containing a diene moiety can be formed in reasonable yields and with excellent chemo‐ and stereoselectivity. This method provides an efficient approach to synthesize macrocyclic compounds containing a 1,3‐conjugated diene
Macrolactam Synthesis via Ring-Closing Alkene–Alkene Cross-Coupling Reactions
作者:Manikantha Maraswami、Jeffrey Goh、Teck-Peng Loh
DOI:10.1021/acs.orglett.0c03801
日期:2020.12.18
Reported herein is a practical method for macrolactam synthesis via a Rh(III)-catalyzed ring closing alkene–alkene cross-couplingreaction. The reaction proceeded via a Rh-catalyzed alkenyl sp2 C–H activation process, which allows access to macrocyclic molecules of different ring sizes. Macrolactams containing a conjugated diene framework could be easily prepared in high chemoselectivities and Z,E
A tethering directing group strategy for ruthenium-catalyzed intramolecular alkene hydroarylation
作者:Praveen Kilaru、Sunil P. Acharya、Pinjing Zhao
DOI:10.1039/c7cc08704g
日期:——
N-heterocycle synthesis that utilizes an alkene-tethered amide moiety as a directing group for aromatic C–H activation. This tethering directing group strategy is demonstrated in a ruthenium-catalyzed intramolecular alkene hydroarylation with N-aryl acrylamides to form oxindole products.
The first Rh-catalyzed enantioselective synthesis of a 3,4-polyfused oxindole ring system enabled by carboacylation of acrylic amides based on C–C activation is reported. This transformation provides a new entry to access 3,4-polyfused oxindoles bearing quaternary stereocenters. Tri- to pentacyclic 3,4-fused oxindoles were asymmetrically generated in good yields (up to 95%) with good to excellent enantioselectivity
Asymmetric bromolactonization reaction: Synthesis of optically active 2-hydroxy-2-methylalkanoic acids from 2-methylenealkanoic acids
作者:Paul F Corey
DOI:10.1016/s0040-4039(00)96213-0
日期:1987.1
Optically pure 2-hydroxy-2-methylalkanoic acids of either configuration may be obtained via an asymmetric bromolactonization reaction using -proline as a chiral auxilliary.