CuH-Catalyzed Enantioselective Intramolecular Reductive Aldol Reactions Generating Three New Contiguous Asymmetric Stereocenters
作者:Bruce H. Lipshutz、Benjamin Amorelli、John B. Unger
DOI:10.1021/ja8045475
日期:2008.11.5
Treatment of beta,beta-disubstituted-alpha,beta-unsaturated ketones bearing a ketone residue with in situ generated, catalytic CuH ligated by a nonracemic ligand leads to three newly created adjacent chiral centers. Excellent de's and ee's are obtained for several examples studied.
Photocatalytic Reductive Formation of α-Tertiary Ethers from Ketals
作者:Thomas Rossolini、Branislav Ferko、Darren J. Dixon
DOI:10.1021/acs.orglett.9b02273
日期:2019.9.6
unsymmetrical α-tertiary dialkyl ethers is reported. By merging Lewis acid-mediated ketal activation and visible-light photocatalytic reduction, in situ-generated α-alkoxy radicals were found to engage in addition reactions with a variety of olefinic partners. Good reaction efficiency is demonstrated with a range of ketals of aromatic and aliphatic ketones. Extension to acetal substrates is also described