Rhodium-Catalyzed Asymmetric Hydrogenation of β-Acetylamino Acrylosulfones: A Practical Approach to Chiral β-Amido Sulfones
摘要:
The efficient and highly enantioselective catalytic asymmetric hydrogenation of beta-acetylamino acrylosulfone has been achieved by employing Rhodium-TangPhos as catalyst. A series of beta-amido sulfone products are obtained with excellent yields and good enantioselectivities.
Efficient Conversion of Sulfones into β-Keto Sulfones by N-Acylbenzotriazoles
摘要:
Acyclic sulfones 4a-f and alicyclic sulfone 7 react with readily available N-acylbenzotriazoles 3a-g (derived from aliphatic, aromatic, and heteroaromatic carboxylic acids) to provide the corresponding beta-keto sulfones 5a-n and 8a-c, respectively, in good to excellent yields.
Catalytic and direct methyl sulfonylation of alkenes and alkynes using a methyl sulfonyl radical generated from a DMSO, dioxygen and copper system
作者:Yaojia Jiang、Teck-Peng Loh
DOI:10.1039/c4sc01901f
日期:——
This paper describes an efficient method to β-keto methyl sulfones and (E)-vinyl methyl sulfones using DMSO as the substrate. The methyl sulfonyl radical generated from DMSO in the presence of catalytic Cu(I) under O2 atmosphere is believed to be involved in this reaction. Isotopic labeling and 18O2 experiments were performed to investigate the reaction mechanism.
本文介绍了一种有效的方法,以DMSO为底物,制备β-酮甲基砜和(E)-乙烯基甲基砜。据信在O 2气氛下在催化性Cu(I)存在下由DMSO产生的甲基磺酰基自由基参与了该反应。进行同位素标记和18 O 2实验以研究反应机理。
strategy has been established for the synthesis of β‐oxo sulfonesvia visible light‐induced oxysulfonylation of alkenes with arylazo sulfones with dioxygen in air. The present photoinduced transformation proceeds smoothly at room temperature in the absence of an external photosensitizer, which not only provides a mild and efficient approach to various β‐oxo sulfones, but also opens a different reaction
One-pot approach for the regioselective synthesis of β-keto sulfones based on acid-catalyzed reaction of sulfonyl chlorides with arylacetylenes and water
Reaction of sulfonylchlorides with arylacetylenes and water in the presence of a catalytic amount of sulfonic acid in THF provided β-keto sulfones in good yields with excellent regioselectivity.
The nickel/(S)-Binapine complex was found to be an efficient catalyst for asymmetric hydrogenation of β-acetylamino vinylsulfones to afford chiral β-Amido sulfones with excellent yields and enantioselectivities (up to 95% yields and >99% ee). This protocol has good compatibility with a series of substituted (Z)-β-acetylamino vinylsulfones or Z/E isomeric mixtures. A gram-scale reaction has also been