Practical metal-free synthesis of chalcone derivatives via a tandem cross-dehydrogenative-coupling/elimination reaction
作者:Yu Wei、Jinghua Tang、Xuefeng Cong、Xiaoming Zeng
DOI:10.1039/c3gc41403e
日期:——
Metal-free synthesis of chalcone derivatives through a tandem cross-dehydrogenative-coupling/eliminationreaction is described. A simple and inexpensive ammonium persulfate salt enables the reaction between ketones and benzylamines to proceed with high stereoselectivity and good functional group compatibility.
Cross-coupling of alcohols to value-added products by using sustainable catalytic reactions has gained attention in recent years. Isomerization of secondary allylic alcohol to the corresponding enolizable ketone is an atom economical and known transformation. Herein, a selective cross-coupling of secondary allylic alcohol and primary alcohol is reported to afford the corresponding α-alkenyl or alkylation
Alkynes react with organoborons under a CO atmosphere in the presence of a rhodium(I) catalyst to afford mainly 5-aryl-2(5H)-furanones, α,β-unsaturated ketones, and indanones. The product selectivity can be tuned by modifying the reaction conditions.
Nickel‐Catalyzed Chemodivergent Coupling of Alcohols: Efficient Routes to Access α,α‐Disubstituted Ketones and α‐Substituted Chalcones
作者:Sadhna Bansal、Benudhar Punji
DOI:10.1002/chem.202304082
日期:2024.3.12
The chemodivergent nickel-catalyzed approach provides α,α-disubstituted ketones from aryl-substituted secondary alcohols and benzyl alcohols via the borrowinghydrogen (BH) strategy in the presence of KOtBu, whereas exclusively α-substituted chalcones were accomplished in the presence of mild base K2CO3 through an acceptorless dehydrogenative coupling (ADC) strategy.
化学发散镍催化方法在 KO t Bu 存在下通过借氢 (BH) 策略从芳基取代的仲醇和苯甲醇提供α , α-二取代酮,而仅α-取代查耳酮是在 KO t Bu 存在下完成的。通过无受体脱氢偶联 (ADC) 策略实现弱碱 K 2 CO 3 。
Asymmetric Hydrogenations of Acyclic α,β-Unsaturated Ketones with Chiral Frustrated Lewis Pairs (FLPs)
作者:Zaiqi Han、Xiangqing Feng、Haifeng Du
DOI:10.1021/acs.joc.3c02031
日期:2023.11.17
In this paper, we demonstrate a metal-free asymmetric hydrogenation of acyclic α,β-unsaturated ketones under the catalysis of a frustratedLewispair (FLP) comprising chiral oxazoline and achiral borane. A wide range of optically active α-substituted ketones were furnished in high yields with 26–85% ee’s.
在本文中,我们展示了在包含手性恶唑啉和非手性硼烷的受挫路易斯对(FLP)的催化下,无环α,β-不饱和酮的无金属不对称氢化。以高产率提供了多种光学活性 α-取代酮,其 ee 为 26-85%。