已经开发出碘催化的β-羟基酮与芳香胺的偶联反应,以产生β-氨基酮和苯并[ h ]喹诺酮。贵金属催化剂,氧化剂,α,β-不饱和酮中间体和氮杂-迈克尔加成均不参与该偶联反应,因此与文献报道的其他反应相比,它具有独特性。廉价的碘催化剂,易于获得的原料,温和的反应条件,良好的官能团耐受性和出色的选择性使这种偶联反应成为一种实用的方法。该反应也可以扩大规模。
Iodine-catalyzed coupling of β-hydroxyketones with aromatic amines to form β-aminoketones and Benzo[h]quinolones
作者:Changqing Miao、Liya Jiang、Lanhui Ren、Qingxia Xue、Fang Yan、Weiwei Shi、Xinjian Li、Jiwen Sheng、Shuangshuang Kai
DOI:10.1016/j.tet.2019.02.041
日期:2019.4
β-unsaturated ketone intermediates and aza-Michael addition were not involved in this coupling reaction which made it unique when compared to otherreactions reported in literature. Inexpensive iodine catalyst, easy accessible raw materials, mild reactionconditions, good functional group tolerance and excellent selectivity made this coupling reaction be a practical method. This reaction can also be
已经开发出碘催化的β-羟基酮与芳香胺的偶联反应,以产生β-氨基酮和苯并[ h ]喹诺酮。贵金属催化剂,氧化剂,α,β-不饱和酮中间体和氮杂-迈克尔加成均不参与该偶联反应,因此与文献报道的其他反应相比,它具有独特性。廉价的碘催化剂,易于获得的原料,温和的反应条件,良好的官能团耐受性和出色的选择性使这种偶联反应成为一种实用的方法。该反应也可以扩大规模。
1,4-Addition of anilines onto Michael acceptors proceeds easily in specific polar protic solvent, without any promoting agent. According to the solvent and to the electrophile, the selectivity of the reaction can be finely tuned. With methyl acrylate as electrophile, only monoaddition takes place in water, while the diadduct is yielded in hexafluoroisopropyl alcohol (HFIP). The use of methyl vinyl ketone as a partner affords the monoadduct in water, the diadduct in trifluoroethanol (TFE), and the quinoline in HFIP.
TBN-Catalyzed Dehydrative N-Alkylation of Anilines with 4-Hydroxybutan-2-one
作者:Wenchen Cheng、Shue Deng、Liya Jiang、Lanhui Ren、Zicheng Wang、Jian Zhang、Weiguo Song
DOI:10.1002/ejoc.201901472
日期:2019.11.30
Until now, the substitution of alcohols by N‐nucleophiles via TBN‐catalyzed dehydrogenation was not known. Herein, we reported a TBN catalyzed dehydrative N‐alkylation of anilines with 4‐hydroxybutan‐2‐one in the presence of TEMPO, which was different from the TEMPO/TBN catalyzed oxidation reactions. A range of anilines reacted successfully with 4‐hydroxybutan‐2‐one to generate the N‐monoalkylation products in good yields. Mechanistic studies revealed that this reaction most possibly proceeded through aza‐Michael addition. Water was the only by‐product, making it more environmentally friendly. The gram‐scale reactions verified the synthetic practicality of this protocol.