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
Rhodium and Isothiourea Dual Catalysis: Enantiodivergent Transformation of Terminal Alkynes
作者:Tao Fan、Zhipeng Shi、Qian-Wei Gong、Jin Song、Liu-Zhu Gong
DOI:10.1021/acs.orglett.4c00029
日期:2024.2.23
A dual rhodium/isothiourea catalytic system was developed for the enantiodivergent transformation of terminal alkynes. Under synergistic rhodium/isothiourea dual catalysis, terminal alkynes can be creatively utilized as precursors for C1-ammonium enolate species, which subsequently participate in [4 + 2] and [2 + 2] annulation reactions with α,β-unsaturated ketimines or ketones, respectively. A wide