Iron-catalyzedacetylation of electron deficient N-heteroarenes has been reported using triethylorthoformate as robust and inexpensive acetyl source. This new method is successfully applied for the acetylation of quinolines, isoquinoline, quinoxalines, arylpyridines, bipyridines, and benzothiazole.
Asymmetric Reductive Amination with Pinacolborane Catalyzed by Chiral SPINOL Borophosphates
作者:Zhenwei Wu、Hualing He、Minglei Chen、Linfei Zhu、Weitao Zheng、Yang Cao、Jon C. Antilla
DOI:10.1021/acs.orglett.2c03866
日期:2022.12.30
The catalyticasymmetric reductive amination of ketones with pinacolborane employing chiral SPINOL-derived borophosphates as catalysts has been realized. A series of chiral amine derivatives bearing multiple functional groups were obtained in good to excellent yields and enantioselectivities (up to 97% yield, 98% ee) under mild reaction conditions. Moreover, the synthetic applicability of the established
使用手性 SPINOL 衍生的硼磷酸盐作为催化剂,酮与频哪醇硼烷的催化不对称还原胺化反应已经实现。在温和的反应条件下,获得了一系列具有多个官能团的手性胺衍生物,具有良好至优异的产率和对映选择性(高达 97% 产率,98% ee)。此外,该方法的合成适用性已通过 ( R )-Fendiline 的不对称合成得到证明。
<i>t</i>
Bu
<sub>4</sub>
NCl/K
<sub>2</sub>
S
<sub>2</sub>
O
<sub>8</sub>
System Induced C‐2 Functionalization of 8‐Aminoquinoline Amides with Primary Alcohols
作者:Kaixin Zhang、Jianxiong Xu、Jinxiang Xiao、Ronglin Zhong、Jizhen Li
DOI:10.1002/ejoc.202201432
日期:2023.2.13
light-free Minisci-type C2−H functionalization approach including acylation and alkylation of 8-aminoquinoline amides with general primary alcohols was demonstrated under tBu4NCl/K2S2O8 system. The chlorine radical induced the original ketyl radical generation from alcohols, and the mechanism for the acylation reaction was investigated in detail.
在t Bu 4 NCl/K 2 S 2 O 8系统下展示了一种金属和无光 Minisci 型 C2−H 功能化方法,包括 8-氨基喹啉酰胺与一般伯醇的酰化和烷基化。氯自由基诱导醇产生原始的羰基自由基,并详细研究了酰化反应的机理。
Enantioselective Radical Addition to Ketones through Lewis Acid-Enabled Photoredox Catalysis
formidable challenge. Accordingly, the development of simple, efficient, and economic catalytic systems is the ideal pursuit for chemists. Herein, we report an enantioselective radical photoaddition to ketones through a Lewis acid-enabled photoredox catalysis wherein the in situ formed chiral N,N′-dioxide/Sc(III)–ketone complex serves as a temporary photocatalyst to trigger single-electron transfer oxidation
2-(1-Aryliminoethylidene)quinolylnickel(II) dibromides: Synthesis, characterization and ethylene dimerization capability
作者:Shengju Song、Yan Li、Carl Redshaw、Fosong Wang、Wen-Hua Sun
DOI:10.1016/j.jorganchem.2011.08.037
日期:2011.11
A series of 2-(1-aryliminoethylidene)quinoline derivatives (L1-L9) and the nickel(II) dibromides (C1-C9) thereof, were synthesized and characterized. The molecular structures of C2 (R-1 = Et, R-2 = H, R = Me) and C9 (R-1 = Pr-i, R-2 = H, R = Pr-i) were confirmed as being distorted tetrahedral at nickel by single crystal X-ray diffraction. On treatment with diethylaluminium chloride (Et2AlCl) or ethylaluminum sesquichloride (EASC), these nickel pre-catalysts exhibited high activity for selective ethylene dimerization (0.89-3.29 x 10(6) g mol(-1)(Ni) h(-1)) at 20 degrees C under 10 atm of ethylene. The influence of the reaction parameters on the catalytic behaviour was investigated for these nickel systems, including variation of Al/Ni molar ratio and reaction temperature. (C) 2011 Elsevier B.V. All rights reserved.