aldehydes has been achieved through a novel synergistic organocatalysis. The HOAc‐ activated 2‐methylquiolines undergo a Michael addition to 1,3‐dimethylbarbituricacid‐activated aldehydes, followed by a retro‐Michael addition to release 1,3‐dimethylbarbituricacid and the target products. The transformation produced various 2‐alkenylquinolines with good to excellent yields and featured mild reaction conditions
Synthesis of (<i>E</i>
)-2-Alkenylazaarenes via Dehydrogenative Coupling of (Hetero)aryl-fused 2-Alkylcyclic Amines and Aldehydes with a Cobalt Nanocatalyst
have developed a low‐loading cobalt nanocatalyst (Co/N‐Si‐C). The combination of such a catalyst with p‐nitrobenzoic acid and molecular O2 exhibits excellent catalytic performance towards the dehydrogenativecoupling of (hetero)aryl‐fused 2‐alkylcyclic amines with aldehydes to afford the (E)‐2‐alkenylazaarenes. In the reaction, effective capture of the partially dehydrogenated cyclic amine motifs appears
迄今为止,通过2-甲基N-杂芳烃与醛或其等同物的缩合反应合成了(E)-2-烯基氮杂芳烃。然而,由广泛分布的2-烷基环胺基序直接形成这类有用的化合物仍未解决。在此,通过使用氮硅掺杂碳(Vulcan XC-72R)作为载体,我们开发了一种低负荷钴纳米催化剂(Co / N -Si-C)。此类催化剂与对硝基苯甲酸和O 2分子的组合对(杂)芳基稠合的2烷基环胺与醛的脱氢偶联反应表现出优异的催化性能,可提供(E)-2-链烯基氮杂芳烃。在反应中,有效捕获部分脱氢的环状胺基序似乎是解决化学选择性问题的关键策略。发达的催化转化技术具有广泛的底物范围,良好的官能团耐受性,高原子效率,使用了地球上可重复使用的富钴催化剂和分子氧2作为绿色氧化剂的优点,这为直接还原反应提供了重要基础。将惰性环状胺单元转化为功能框架。