Synthesis and characterization of oxadisilole-fused-3,4-dihydro-2H-naphtho[2,1-e]-1,3-oxazines and 3,4-dihydro-2H-anthra[2,1-e]-1,3-oxazines
摘要:
Oxadisilole-fused-3,4-dihydro-2H-naphtho[2,1-e]-1,3-oxazines and 3,4-dihydro-2H-anthra[2,1-e]-1,3-oxazines were synthesized through an eco-friendly Mannich type condensation-cyclization reaction of oxadisilole-fused-1-naphthalenol or 1-anthracenol with formaldehyde and primary amines at ambient temperature in high to excellent yields. The photophysical, electrochemical, and thermal properties of these 3,4-dihydro-2H-anthra[2,1-e]-1,3-oxazine derivatives were also studied. (C) 2013 Elsevier Ltd. All rights reserved.
1,2-Didehydronaphthalene (1-naphthyne) was produced in a low temperature argon matrix by wavelength-selective photolysis of 1,2-naphthalenedicarboxylic anhydride, which was confirmed by comparison of its FTIR spectrum with the theoretical IR spectrum calculated by density functional theory.
Preparation and spectroscopic studies of the 1,4-dihydro- 1,4-iminonaphthalene (7-azabenzonorbornadiene) ring system
作者:John W. Davies、Michael L. Durrant、Matthew P. Walker、Djaballah Belkacemi、John R. Malpass
DOI:10.1016/s0040-4020(01)88190-4
日期:——
(7-azabenzonorbornadienes) and reduced derivatives is described together with 1,4-dihydro-1,4- and 9,10-dihydro-9,10- iminoanthracenes. VT NMR studies lead to unambiguous assignment of invertomer preferences; changes in the invertomer ratios and nitrogen inversion barriers are investigated as the electronic and steric environment is modified by variation of substituents in the carbon skeleton and at nitrogen
作者:Albert Lee、Ya-Li Chen、Man-Ho Lee、Wai-Yeung Wong
DOI:10.1055/s-2006-950420
日期:2006.9
The first synthesis of monooxadisilole- and bisoxadisilole-fused isoindoles and their [4+2]-cycloaddition reactions are reported. Deprotection of the cycloadducts leads to the formation of oxadisilole-fused benzoquinones. The structure of the bisoxadisilole-fused isoindole (2b) is confirmed by X-ray analysis.
本研究首次报道了单噁二唑和双噁二唑融合异吲哚的合成及其 [4+2]- 环加成反应。环加载产物的脱保护作用导致形成噁二硅烷基融合苯醌。通过 X 射线分析证实了双噁二硅烷基融合异吲哚 (2b) 的结构。
Enantioselective aza-Friedel–Crafts reaction of furan with α-ketimino esters induced by a conjugated double hydrogen bond network of chiral bis(phosphoric acid) catalysts
Chiral C2- and C1-symmetric BINOL-derived bis(phosphoric acid) catalysts, which have OP(O)(OH)2/OP(O)(OH)(OR) moieties at the 2,2′-positions, were developed and used for the enantioselective aza-Friedel–Crafts reaction of 2-methoxyfuran with α-ketimino esters for the first time. The intramolecular conjugated double hydrogen bond network is a key to increasing the Brønsted acidity and preventing deactivation