Catalytic Activation of Carbohydrates as Formaldehyde Equivalents for Stetter Reaction with Enones
作者:Junmin Zhang、Chong Xing、Bhoopendra Tiwari、Yonggui Robin Chi
DOI:10.1021/ja401511r
日期:2013.6.5
We disclose the first catalytic activation of carbohydrates as formaldehyde equivalents to generate acyl anions as one-carbon nucleophilic units for a Stetter reaction. The activation involves N-heterocyclic carbene (NHC)-catalyzed C-C bone cleavage of carbohydrates via a retro-benzoin-type process to generate the acyl anion intermediates. This Stetter reaction constitutes the first success in generating formal formaldehyde-derived acyl anions as one-carbon nucleophiles for non-self-benzoin processes. The renewable nature of carbohydrates, accessible from biomass, further highlights the practical potential of this fundamentally interesting catalytic activation.
Iodine-Catalyzed Regioselective Synthesis of Diphenyl-Substituted Carbazoles via [4 + 2] Annulation of β-Formyl Ketones with Indoles
作者:Sundaram Suresh、Hung-Sheng Chien、Chao-Hua Chen、Hao-Yu Tsai、Dai-Ru Chung、Veerababurao Kavala、Ching-Fa Yao
DOI:10.1021/acs.joc.3c01857
日期:2023.12.15
β-formyl ketones with an indole has been developed for the regioselective synthesis of diphenyl-substituted carbazoles in the presence of a catalytic amount of iodine. The 1,4-dicarbonyl compound containing a phenyl group at the α-position of an aldehyde group reacts more readily with indoles to form carbazolederivatives. Using this method, a variety of carbazolederivatives can be readily accessed