An Upstream By-product from Ester Activation via NHC-Catalysis Catalyzes Downstream Sulfonyl Migration Reaction
作者:Runfeng Han、Liwenze He、Lin Liu、Xingang Xie、Xuegong She
DOI:10.1002/asia.201500959
日期:2016.1
A sequential reaction combining N‐heterocyclic carbene (NHC) and N‐hydroxyphthalimide (NHPI) catalysis allowed for the upstream by‐product NHPI, which was generated in the NHC‐catalyzed cycloaddition reaction, to act as the catalyst for a downstream nitrogen‐to‐carbon sulfonylmigrationreaction. Enantiomeric excess of the major product in the cycloaddition reaction remained intact in the follow‐up
Catalytic Generation of C1 Ammonium Enolates from Halides and CO for Asymmetric Cascade Reactions
作者:Lu‐Lu Li、Du Ding、Jin Song、Zhi‐Yong Han、Liu‐Zhu Gong
DOI:10.1002/anie.201901501
日期:2019.6.3
the design of asymmetric cascade reactions using readily available halides and carbon monoxide (CO) as substrates is developed. The key is the catalytic generation of C1‐ammonium enolates for the subsequent asymmetric cascade reactions through the combination of palladium‐catalyzed carbonylation and chiral Lewis base catalysis. Utilizing this strategy, we have established asymmetric formal [1+1+4]