Copper‐Catalyzed Enantio‐, Diastereo‐, and Regioselective [2,3]‐Rearrangements of Iodonium Ylides
作者:Bin Xu、Uttam K. Tambar
DOI:10.1002/anie.201705317
日期:2017.8.7
The first highly enantioselective, diastereoselective, and regioselective [2,3]-rearrangement of iodonium ylides has been developed as a general solution to catalytic onium yliderearrangements. In the presence of a chiral copper catalyst, substituted allylic iodides couple with α-diazoesters to generate metal-coordinated iodonium ylides, which undergo [2,3]-rearrangements with high selectivities (up
Enantioselective Synthesis of Dihydrobenzofurans, Dihydrobenzosulfones, and Dihydroindoles by Merging One‐pot Intramolecular Heck‐Matsuda Reactions from Anilines with Redox‐Relay Process
A one-pot tandem protocol is reported for the enantioselective Pd-catalyzed synthesis of dihydrobenzofuran, dihydroindole, and dihydrobenzosulfone scaffolds by a Heck-Matsuda reaction under open-flask conditions with in situ generation of aryldiazonium salt directly from anilines. The enantioenriched heterocycles are synthesized in overall yields up to 78 % in enantiomeric ratios up to 99 : 1 by a
A copper-catalyzed asymmetric intramolecular O-H insertion of omega-hydroxy-alpha-diazoesters has been accomplished by using chiral spiro bisoxazoline ligands. This highly enantioselective intramolecular O-H insertion reaction provides an efficient approach to a variety of synthetically important chiral 2-carboxy cyclic ethers with different ring sizes as well as substitution patterns.