Multifunctionalization of Unactivated Cyclic Ketones via an Electrochemical Process: Access to Cyclic α-Enaminones
作者:Kangfei Hu、Peng Qian、Ji-Hu Su、Zhibin Li、Jiawei Wang、Zhenggen Zha、Zhiyong Wang
DOI:10.1021/acs.joc.8b02930
日期:2019.2.1
The multifunctionalization of unactivated cyclicketones was developed via an electrochemically intermolecular α-amination under metal-free conditions. The reaction can be carried out smoothly with a broad scope of the aromatic amines substrates under mild conditions, affording a variety of α-enaminones with good to excellent yields in one step.
Umsetzung von 2-Amino-2-cycloalken-1-on-Derivaten mitp-Benzochinonen, 3. Mitteilung
作者:Uwe Kuckländer、Krystina Kuna、Bettina Schneider
DOI:10.1002/ardp.19933260708
日期:——
Die Reaktion von 1 mit 2a führt zum Benzoxazin 3a: Nebenprodukt ist ein 2,3‐Bisaddukt 4. Das Chinon 6 wird aus 1b und 2b erhalten. Die Umsetzungvon 8 und 9a gibt das Benzofuran 11, das zum Hydrochinon‐Derivat 14 acetyliert bzw. in 13 übergeführt wird. 8 reagiert mit 9b zu 7a. 16a,b wird aus 8 oder 1 mit 15 gebildet. 16a acetylieren und zu 17a umsetzen.
Addition of 2-morpholino-2-cyclohex-1-en-one 2 to 2-acetyl-quinone 1 yields benzo[c][4H]chro-men-4,7,10-trion 4 which is unstable and rearranges to 5. 4 is converted to 3-(2,5-dihydroxy-phenyl)-2-mor-pholino-2-cyclohex-1-en-on 3 thermically and to dibenzo[b,d]furan-4-on 7 acid catalyzed. The structure of 7 is secured by independent synthesis. Dibenzo[b,d]furan-4-on 14 is the product of reaction from 2-(p-toluidino)-2-cyclohex-1-en-on 9 and 1 with benzo [c] [4H] chromen-4,7, 10-trion 10 as intermediate. By proton catalysis 5-acetyl-6-hydroxy-carbazol-1-on 13 and 4-oxo-cyclohexa[c]isochinolinium hydrochlorid 15 is obtained from 10. 1H-cyclopenta[d]furan-3-on 17 is formed by addition of 2-(p-toluidino)-2-cyclo-pent-1-en-on 16 to 1. It is rearranged by proton catalysis to 3-oxo-1 H-cyclopenta[c]isochinolinium salt 18. Reaction of cyclopentan-1,2-dione and 1 yields 3 aH-cyclopenta[c]isochromen-3,6,9-trion 20, rearranging to 1H-cyclopenta[b]benzo[d]furan-3-on 21. The s stereochemistry of adducts is discussed in connection with the course of the reaction, spectroscopical evidence, molecular modelling and calculation of HOMO/LUMO and AO-coefficients.
POLOZOV, G. I.;TISHCHENKO, I. G., BECTH. BELORUS. YH-TA, 1986, N 1, 67-69
作者:POLOZOV, G. I.、TISHCHENKO, I. G.
DOI:——
日期:——
KUCKLANDER, UWE;SCHNEIDER, BETTINA, CHEM. BER., 121,(1988) N 3, 577-579