Gold(I)-Catalyzed Synthesis of Highly Substituted 1,4-Dicarbonyl Derivatives via Sulfonium [3,3]-Sigmatropic Rearrangement
作者:Weiping Zhou、Arnaud Voituriez
DOI:10.1021/acs.orglett.0c04023
日期:2021.1.1
2-substituted 4-oxo-4-arylbutanal derivatives from commercially available or easily accessible alkynes and vinylsulfoxide substrates has been developed. Extension of the methodology to the use of 1-cycloalkenyl sulfoxides allowed the facile synthesis of five-, six-, and seven-membered-ring cycloalkyl-1-one backbone. Subsequently, the tetrahydrocycloalkyl[b]pyrrole derivatives, which are found in many active
已经开发了一种有效且直接的金催化方案,用于从市售或易于获得的炔烃和乙烯基亚砜底物合成2-取代的4-氧代-4-芳基丁醛衍生物。方法的扩展到使用1-环烯基亚砜使得可以容易地合成五,六和七元环的环烷基-1-一主链。随后,以良好的产率分离出了在许多活性药物成分中发现的四氢环烷基[ b ]吡咯衍生物。机理研究突出了在此过程中a中间体的[3,3]-σ重排。
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
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.