Regioselective Azidation of 2,4-Dichloroquinolines
摘要:
Reactions of 2,4-dichloroquinolines (2a-f) with sodium azide in DMF lead either regioselectively to 4-azido-2-chloroquinolines (3a-f) or with excess of sodium azide and catalysts to 5-azido-tetrazolo[1,5-a]quinolines (4a-f). 2,4-Dichloroquinolines (2g-i) having electron donating substituents in 3-position react with sodium azide in DMF to a mixture of 4-azido-2-chloroquinolines (3g-i) and 5-chloro-tetrazolo[1,5-a]quinolines (5g-i). When the reaction of the 2,4-dichloroquinolines (2a-i) with sodium azide is carried out in ethanol with addition of methanesulfonic acid, regioselectively 5-chloro-tetrazolo[1,5-a]quinolines (5a-i) are obtained. Structural assignments of 3 and 5 have been carried out by C-13-NMR spectra, IR spectra and degradation reactions of the azido- and tetrazolo group to aminoquinolines (7 and 10) via iminophosphoranes (8 and 9). It could be shown that in 2-azido/tetrazolo-quinolines (4 and 5) the tetrazole ring structure is the dominant species.
Syntheses and binding affinities of 6-nitroquipazine analogues for serotonin transporter. Part 4: 3-Alkyl-4-halo-6-nitroquipazines
摘要:
On the basis of the structure activity relationship (SAR) of 4-chloro-6-nitroquipazine (K-i = 0.03 nM) and 3-fluoropropyl-6-nitroquipazine (K-i = 0.32 nM), 3-alkyl-4-halo-6-nitroquipazines were synthesized and tested for their potential abilities in vitro to displace [H-3]citalopram binding to the rat cortical membranes. Binding affinities of 3h and 4d were K-i = 2.70 +/- 0.32 and 2.23 +/- 0.46 nM. respectively. The syntheses of 3-alkyl-4-halo-6-nitroquipazine. their in vitro binding affinitics. and the SAR of C3, C4 position in 6-nitroquipazine are described. (c) 2005 Elsevier Ltd. All rights reserved.
not react with phosphoryl chloride, however, 2,4-dichloroquinolines and/or 4-chloroquinolin-2-ones are formed in the presence of N,N-dimethylaniline. Along with these compounds, small quantities of novel dihydrogen phosphates of 4-hydroxyquinolin-2-ones were isolated. We outline a simple procedure that allows for the preparation of these compounds in moderate to good yields. All compounds were characterized
3-氯喹啉-2,4-二酮不与磷酰氯反应,但是,在N,N-二甲基苯胺存在下会形成2,4-二氯喹啉和/或4-氯喹啉-2-酮。与这些化合物一起,分离出少量的4-羟基喹啉-2-酮的新型磷酸二氢酯。我们概述了一个简单的步骤,可以以中等到良好的产率制备这些化合物。所有化合物均通过1 H和13 C NMR,IR,EI-MS和ESI-MS光谱进行表征,在某些情况下通过31 P NMR光谱进行表征。
Syntheses and binding affinities of 6-nitroquipazine analogues for serotonin transporter. Part 4: 3-Alkyl-4-halo-6-nitroquipazines
作者:Byung Seok Moon、Byoung Se Lee、Dae Yoon Chi
DOI:10.1016/j.bmc.2005.05.031
日期:2005.8
On the basis of the structure activity relationship (SAR) of 4-chloro-6-nitroquipazine (K-i = 0.03 nM) and 3-fluoropropyl-6-nitroquipazine (K-i = 0.32 nM), 3-alkyl-4-halo-6-nitroquipazines were synthesized and tested for their potential abilities in vitro to displace [H-3]citalopram binding to the rat cortical membranes. Binding affinities of 3h and 4d were K-i = 2.70 +/- 0.32 and 2.23 +/- 0.46 nM. respectively. The syntheses of 3-alkyl-4-halo-6-nitroquipazine. their in vitro binding affinitics. and the SAR of C3, C4 position in 6-nitroquipazine are described. (c) 2005 Elsevier Ltd. All rights reserved.
Regioselective Azidation of 2,4-Dichloroquinolines
作者:Waltraud Steinschifter、Wolfgang Stadlbauer
DOI:10.1002/prac.19943360407
日期:——
Reactions of 2,4-dichloroquinolines (2a-f) with sodium azide in DMF lead either regioselectively to 4-azido-2-chloroquinolines (3a-f) or with excess of sodium azide and catalysts to 5-azido-tetrazolo[1,5-a]quinolines (4a-f). 2,4-Dichloroquinolines (2g-i) having electron donating substituents in 3-position react with sodium azide in DMF to a mixture of 4-azido-2-chloroquinolines (3g-i) and 5-chloro-tetrazolo[1,5-a]quinolines (5g-i). When the reaction of the 2,4-dichloroquinolines (2a-i) with sodium azide is carried out in ethanol with addition of methanesulfonic acid, regioselectively 5-chloro-tetrazolo[1,5-a]quinolines (5a-i) are obtained. Structural assignments of 3 and 5 have been carried out by C-13-NMR spectra, IR spectra and degradation reactions of the azido- and tetrazolo group to aminoquinolines (7 and 10) via iminophosphoranes (8 and 9). It could be shown that in 2-azido/tetrazolo-quinolines (4 and 5) the tetrazole ring structure is the dominant species.