Asymmetric Intramolecular Oxa-Michael Reactions to Tetrahydrofurans/2<i>H</i>-Pyrans Catalyzed by Primary–Secondary Diamines
作者:Yingpeng Lu、Gang Zou、Gang Zhao
DOI:10.1021/cs4002332
日期:2013.6.7
The asymmetricintramolecularoxa-Michaelreactions of α,β-unsaturated ketones have been achieved by using readily accessible primary–secondary diamines as the organocatalysts, giving the synthetically useful tetrahydrofurans/2H-pyrans in good yields and with high enantioselectivities (up to 90% ee).
Gold‐Catalyzed Asymmetric Transformation of Hydroxylated Propargylic Esters
作者:Carlos D. Quintanilla、Ke Zhao、Liming Zhang
DOI:10.1002/cplu.202300314
日期:2023.10
A one-pot transformation of hydroxylated propargylic benzoate into chiral ketones featuring an O-heterocycle is realized via sequential gold catalysis and basic hydrolysis. The gold chemistry entails tandem 3,3-sigmatropic rearrangement and asymmetric cyclization of hydroxylated allenyl ester intermediates, which is achieved via asymmetric metal-ligand cooperation. The products were formed with good