One-Pot Metal-Free Cascade Synthesis of 2-(Perfluoroalkyl)pyrroles
作者:Xuechun Sun、Jing Han、Jie Chen、Hongmei Deng、Min Shao、Hui Zhang、Weiguo Cao
DOI:10.1002/ejoc.201501010
日期:2015.11
An efficient synthesis of 2-(perfluoroalkyl)pyrroles that employs a sequential one-pot three-component reaction between substituted ω-bromoacetophenones, anilines, and methyl perfluoroalk-2-ynoates has been developed. This transition-metal-free cascade process provides a practical way to construct perfluoroalkylated pyrroles in moderate to good yields.
A number of opticallyactive amino alcohols were synthesized by direct asymmetric transfer hydrogenation of the corresponding amino ketones with good-to-high enantiomeric excesses (up to 95%) and excellent yields (up to 93% ). When the range of substrates was broadened to include α-sulfonamido ketones or α-keto sulfones, the corresponding products were obtained with 100% enantiomeric excesses. The
Die N‐(4′‐Nitrophenacyl)‐arylamine 5, hergestellt aus den Arylaminen 3 und 4‐Nitrophenacylbromid (2), haben in Abhängigkeit von den Arylsubstituenten eine gelbe, rote oder violette Farbe. Sie wird zurückgeführt auf intramolekulareWechselwirkung zwischen dem Nitrobenzoylsystem als Elektronenacceptor und dem Arylaminteil als Elektronendonator. Bei Acetylierung des Aminstickstoffs geht die Farbe verloren
Die N-(4'-Nitrophenacyl)-arylamine 5, hergestellt aus den Arylaminen 3 和 4-Nitrophenacylbromid (2), haben in Abhängigkeit von den Arylsubstituenten eine gelbe, rote oder violette Farbe。Sie wird zurückgeführt auf intramolekulare Wechselwirkung zwischen dem Nitrobenzoylsystem als Elektronenacceptor und dem Arylaminteil als Elektronendonator。Be Acetylierung des Aminstickstoffs geht die Farbe verloren。Für
Synthesis of ( Z )-nitroalkene derivatives through oxidative dehydrogenation coupling of α -aminocarbonyl compounds with nitromethane by copper catalysis
作者:Menghua Zhu、De Chen、Sheng Zeng、Chenhu Xing、Wei Deng、Jiannan Xiang、Rui-Jia Wang
DOI:10.1016/j.tetlet.2018.07.032
日期:2018.8
A novel copper-catalyzed cross-dehydrogenative coupling reaction of α-amino carbonyl compounds with nitromethane to synthesis of (Z)-nitroalkene derivatives has been established. (Z)-Nitroalkene derivatives are achieved through the cleavage of sp3 CsbndH bonds and formation of CsbndC double bond, with mild reaction conditions and excellent stereoselectivity.
Rh‐Catalyzed Chemodivergent [3+3] Annulations of Diazoenals and α‐Aminoketones: Direct Synthesis of Functionalized 1,2‐Dihydropyridines and Fused 1,4‐Oxazines
作者:Pratap Kumar Mandal、Sreenivas Katukojvala
DOI:10.1002/chem.202303862
日期:2024.4.2
Chemodivergent [3+3] annulations: The reactivity of Rh-enalcarbenoid has been switched from carbenoid to vinylogous NH-insertion by altering acyclic to cyclic α-amino ketones to deliver functionalized 1,2-dihydropyridines (1,2-DHPs) and fused 1,4-oxazines respectively. The structural diversification of 1,2-DHP and fused 1,4-oxazines gave valuable piperidines, pyrido[1,2-a]indole, 2-pyridone, hexahydroquinolin-2(1H)-ones