Photoredox Cross-Coupling: Ir/Ni Dual Catalysis for the Synthesis of Benzylic Ethers
作者:Idris Karakaya、David N. Primer、Gary A. Molander
DOI:10.1021/acs.orglett.5b01463
日期:2015.7.2
Single-electron transmetalation has emerged as an enabling paradigm for the cross-coupling of C-sp(3) hybridized organotrifluoroborates. Cross-coupling of alpha-alkoxymethyl-trifluoroborates with aryl and heteroaryl bromides has been demonstrated by employing dual catalysis with a combination of an iridium photoredox catalyst and a Ni cross-coupling catalyst. The resulting method enables the alkoxymethylation of diverse (hetero)arenes under mild, room-temperature conditions.
A Highly Efficient Method for the Reductive Etherification of Carbonyl Compounds with Triethylsilane and Alkoxytrimethylsilane Catalyzed by Iron(III) Chloride
Facile reductive etherification of carbonylcompounds can be conveniently performed by reaction with triethylsilane and alkoxytrimethylsilane catalyzed by iron(III) chloride. The corresponding alkyl ethers, including benzyl and allyl ethers, of the reduced alcohols were obtained in good to excellent yields under mild reaction conditions.
Enantioselective Cobalt‐Catalyzed Hydroboration of Ketone‐Derived Silyl Enol Ethers
作者:Wenke Dong、Zhiyang Ye、Wanxiang Zhao
DOI:10.1002/anie.202117413
日期:2022.7.18
heteroatom-substituted alkenes is rarely explored and remains unprecedented, especially the earth-abundant metal catalyzed ones. Herein, the first cobalt-catalyzed asymmetric hydroboration of ketone-derived silylenolethers is reported, providing a convenient approach to access valuable enantiopure β-hydroxy boronic esters, which features broad substrate scope and excellent enantioselectivities.