Lewis Acid Catalyzed Diastereoselective 1,3-Dipolar Cycloaddition between Diazoacetoacetate Enones and Azomethine Ylides
摘要:
Silver acetate catalyzed 1,3-dipolar cycloaddition reactions of diazoacetoacetate enones and azomethine ylides produce tetrasubstituted pyrrolidines bearing a diazoacetoacetate functional array in excellent yields and diastereoselectivities. The installment of the diazoacetoacetate functional array allows access to diverse hetereocyclic scaffolds.
Stereoselective Synthesis of Fully Substituted β-Lactams via Metal–Organo Relay Catalysis
作者:Long Chen、Kai Wang、Ying Shao、Jiangtao Sun
DOI:10.1021/acs.orglett.9b01255
日期:2019.5.17
A novel three-component reaction of N-hydroxyanilines, enynones, and diazo compounds has been developed via a metal–organo relay catalysis, providing highly functionalized β-lactams containing two quaternary carbon centers in good yields and with excellent diastereoselectivities. This protocol features a sequential reaction of Rh-catalyzed imine formation, Wolff rearrangement, and benzoylquinine-catalyzed
Copper-Catalyzed Annulation of Indolyl α-Diazocarbonyl Compounds Leads to Structurally Rearranged Carbazoles
作者:Sima Alavi、Jian-Bin Lin、Huck K. Grover
DOI:10.1021/acs.orglett.1c01965
日期:2021.7.16
Indolyl α-diazocarbonyl compounds have proven to be effective starting materials for the construction of various 2,3-ring fused indole frameworks. Activation of the diazo functional group under metal catalysis generates a spiro-cyclic indolenine-type intermediate which rearranges to provide two distinct carbazoles upon oxidation. The current study investigates the effects of the catalyst as well as