通过2-萘酚,2-硝基苯甲醛与氨基甲酸叔丁酯或氨基甲酸苄酯的反应合成了一种新的高度官能化的氨基萘酚衍生物(1-(氨基(2-氨基苯基)甲基)-2-萘酚(4)还原和/或去除保护基。如此获得的氨基萘酚衍生物在与甲醛,苯甲醛和/或光气的闭环反应中转化为相应的萘并[1,2- e ] [1,3]恶嗪基[3,4- c ]喹唑啉衍生物。还报道了通过NMR光谱对某些衍生物的构象分析和伴随的分子模型。
通过2-萘酚,2-硝基苯甲醛与氨基甲酸叔丁酯或氨基甲酸苄酯的反应合成了一种新的高度官能化的氨基萘酚衍生物(1-(氨基(2-氨基苯基)甲基)-2-萘酚(4)还原和/或去除保护基。如此获得的氨基萘酚衍生物在与甲醛,苯甲醛和/或光气的闭环反应中转化为相应的萘并[1,2- e ] [1,3]恶嗪基[3,4- c ]喹唑啉衍生物。还报道了通过NMR光谱对某些衍生物的构象分析和伴随的分子模型。
The reactions of 1-(amino(2-hydroxyphenyl)methyl)-2-naphthol (3) and 1-(amino(2-aminophenyl) methyl)-2-naphthol (6) with glutardialdehyde resulted in the formation of piperidine-fused benzox-azinonaphthoxazine 4 and quinazolinonaphthoxazine 7, respectively, both in diastereopure form.The full conformational search protocols of 4 and 7 were successfully carried out by NMR spectroscopy and accompanying molecular modelling; the global minimum-energy conformers of all diastereomers were computed, and the assignments of the most stable stereoisomers, G(tct)(1) for 4 and G(tct)(1) for 7, were corroborated by spatial NOE information relating to the H-7a-H-10a-H-15b and H,H coupling patterns of the protons in the flexible part of the piperidine moiety. Additionally, mass spectrometric fragmentation was investigated in collision-induced dissociation experiments. The elemental compositions of the ions were determined by accurate mass measurements. (C) 2012 Elsevier Ltd. All rights reserved.
Synthesis and conformational analysis of new naphth[1,2-e][1,3]oxazino[3,4-c]quinazoline derivatives
作者:Renáta Csütörtöki、István Szatmári、Andreas Koch、Matthias Heydenreich、Erich Kleinpeter、Ferenc Fülöp
DOI:10.1016/j.tet.2011.08.074
日期:2011.11
functionalized aminonaphthol derivative, 1-(amino(2-aminophenyl)methyl)-2-naphthol (4), was synthesized by the reaction of 2-naphthol, 2-nitrobenzaldehyde and tert-butyl carbamate or benzyl carbamate, followed by reduction and/or removal of the protecting group. The aminonaphthol derivative thus obtained was converted in ring-closure reactions with formaldehyde, benzaldehyde and/or phosgene to the corresponding
通过2-萘酚,2-硝基苯甲醛与氨基甲酸叔丁酯或氨基甲酸苄酯的反应合成了一种新的高度官能化的氨基萘酚衍生物(1-(氨基(2-氨基苯基)甲基)-2-萘酚(4)还原和/或去除保护基。如此获得的氨基萘酚衍生物在与甲醛,苯甲醛和/或光气的闭环反应中转化为相应的萘并[1,2- e ] [1,3]恶嗪基[3,4- c ]喹唑啉衍生物。还报道了通过NMR光谱对某些衍生物的构象分析和伴随的分子模型。