efficient alkylation of β-chloro ketones and their derivatives was achieved by means of domino dehydrochlorination/Mn-enabled radical-based alkyl-alkyl cross-coupling reaction. In situ-generated α,β-unsaturated ketones and their analogues were identified as the reaction intermediates. Known bioactive compounds, such as melperone and azaperone, could be easily prepared from β-chloropropiophenone in two
A Bipyridine‐Promoted Csp
<sup>3</sup>
−Csp
<sup>3</sup>
Coupling of
<i>beta</i>
‐Chlorophenones
作者:Bao Li、Junrui Wang、Jie Wang、Yingsheng Zhao
DOI:10.1002/asia.202300030
日期:——
β-chlorophenone with alkanes using 2-(tert-butylperoxy)-2-methylpropane as the oxidant and 2,2′-bipyridine as the catalyst was reported. A variety of β-chloropropiophenones were tolerated, leading to the alkylated products in moderate to good yields. Preliminary mechanistic studies suggested that the in situ formed quaternary ammonium salt activated unsaturated ketone, leading to the alkyl-alkyl cross-coupling
Organocatalyzed Double C(sp<sup>3</sup>)−H Alkylation of Cyclic <i>N</i>‐Sulfonyl Ketimines with 3‐Chloropropiophenones: Selective Access to 2,3,6‐Trisubstituted Pyridines
作者:Ashvani Kumar Patel、Sampak Samanta
DOI:10.1002/ejoc.202300631
日期:2023.9
Efficient de novo access to 2,3,6-trisubstituted pyridines was successfully synthesized through a mono- or dialkylation reaction between 4/3-alkyl-N-sulfonyl ketimines with 3-chloropropiophenones using DIPEA/NaHCO3 as a cheap cooperative basic system and subsequent aza-cyclization in the presence of NH4OAc under an air.
I
<sub>2</sub>
‐Promoted Intramolecular Oxidative Cyclization of Butenyl Anilines: A Facile Route to Benzo[
<i>b</i>
]azepines
作者:Zhenyu An、Yi Ren、Yafeng Liu、Rulong Yan
DOI:10.1002/asia.202100710
日期:2021.9.20
An efficient strategy for the synthesis of benzo[b]azepine derivatives has been developed by the I2-promoted intramolecular cross-coupling/annulation of butenyl anilines. This cyclization reaction involves C−H activation and C−C bond formation. A series of benzo[b]azepine derivatives are obtained in moderate to good yields.
通过 I 2促进的丁烯基苯胺的分子内交叉偶联/环化,已经开发出一种用于合成苯并[ b ]氮杂卓的有效策略。这种环化反应涉及 C-H 活化和 C-C 键的形成。以中等至良好的收率获得了一系列苯并[ b ]氮杂衍生物。
A new type of δ-vinylvalerolactone for palladium-catalyzed cycloaddition: synthesis of nine-membered heterocycles
In this paper, a new type of δ-vinylvalerolactone was designed and synthesized, and used as a new precursor in Pd-catalyzed [6+3] cycloaddition with azomethine imines, leading to nine-membered 1,2-dinitrogen-containing heterocycles in 77–98% yields with >20 : 1 d.r. These nine-membered ring-fused products were further transformed into unusual tetracyclic bridged-ring compounds without loss of the
本文设计合成了一种新型的δ-乙烯基戊内酯,并作为新的前驱体用于Pd催化的[6+3]与偶氮甲亚胺的环加成反应,生成了9元1,2-含二氮杂环。 77–98% 产率,>20 : 1 dr 这些九元环稠合产物进一步转化为不寻常的四环桥环化合物,而不会损失非对映选择性。