Triaminophosphine ligands for carbon-nitrogen and carbon-carbon bond formation
申请人:Iowa State University Research Foundation, Inc.
公开号:US07385058B1
公开(公告)日:2008-06-10
Methods and compounds are provided for the formation of carbon-nitrogen or carbon-carbon bonds comprising reacting an amine or an aryl boronic acid with an aryl halide in the presence of a palladium catalyst, a base, and a compound of formula II:
Synthesis of N-aryl-aza-crown ethers via Pd-catalyzed amination reactions of aryl chlorides with aza-crown ethers
作者:Sameer Urgaonkar、John G. Verkade
DOI:10.1016/j.tet.2004.09.100
日期:2004.12
The Pd2(dba)3/P(i-BuNCH2CH2)3N (1) catalyst system effectively catalyzes the coupling of aza-crownethers with electronically diverse aryl chlorides, affording N-aryl-aza-crown ethers in good yields. The Pd2(dba)3/P(i-BuNCH2)3CMe (2) catalyst system containing the more constrained bicyclic triaminophosphine is useful for aryl chlorides possessing base-sensitive ester, nitro, and nitrile functional
Selective Colorimetric Detection of Hg2+ and Mg2+ with Crown Ether Substituted N-Aryl-9-aminobenzo[b]quinolizinium Derivatives
作者:Maoqun Tian、Heiko Ihmels
DOI:10.1002/ejoc.201100329
日期:2011.8
thiaazacrown ether followed by deprotonation of the secondary 9-amino substituent of the aminobenzoquinolizinium unit. The resulting amide functionality increases the donor–acceptor interplay leading to the redshifted absorption and also coordinates to Hg2+ to form a lariat ether type complex. A similar effect was observed upon the addition of Mg2+ to the 9-amino-N-phenylbenzo[b]quinolizinium derivative with
Nitro derivatives of N-alkylbenzoaza-15-crown-5: synthesis, structures, and complexation with metal and ammonium cations
作者:S. N. Dmitrieva、M. V. Churakova、N. A. Kurchavov、A. I. Vedernikov、L. G. Kuz’mina、A. Ya. Freidzon、A. A. Bagatur’yants、Yu. A. Strelenko、J. A. K. Howard、S. P. Gromov
DOI:10.1007/s11172-010-0222-0
日期:2010.6
A number of N-alkylnitrobenzoaza-15-crown-5 with the macrocycle N atom conjugated with the benzene ring were obtained. The structural and complexing properties of these compounds were compared with those of model nitrobenzo- and N-(4-nitrophenyl)aza-15-crown-5 using X-ray diffraction, 1H NMR spectroscopy, and DFT calculations. The macrocyclic N atom of benzoazacrown ethers are characterized by a considerable contribution of the sp3-hybridized state and a pronounced pyramidal geometry; the crownlike conformation of the macrocycle is preorganized for cation binding, which facilitates complexation. The stability constants of the complexes of crown ethers with the NH4 +, EtNH3 +, Na+, K+, Ca2+, and Ba2+ ions were determined by 1H NMR titration in MeCN-d3. The most stable complexes were obtained with alkaline-earth metal cations, which is due to the higher charge density at these cations. The characteristics of the complexing ability of N-alkylnitrobenzoaza-15-crown-5 toward alkaline earth metal cations are comparable with analogous characteristics of nitrobenzo-15-crown-5 and are much better than those of N-(4-nitrophenyl)aza-15-crown-5.
研究人员获得了一些 N-烷基硝基苯并氮杂-15-冠醚-5,其大环 N 原子与苯环共轭。利用 X 射线衍射、1H NMR 光谱和 DFT 计算将这些化合物的结构和络合性质与模型硝基苯并氮杂环-15-冠-5 和 N-(4-硝基苯基)氮杂环-15-冠-5 的结构和络合性质进行了比较。苯并氮冠醚的大环 N 原子具有相当大的 sp3 杂化态贡献和明显的金字塔几何特征;大环的冠状构象为阳离子结合预组织,这有利于络合。冠醚与 NH4+、EtNH3+、Na+、K+、Ca2+ 和 Ba2+ 离子的络合物的稳定常数是在 MeCN-d3 中通过 1H NMR 滴定法测定的。碱土金属阳离子得到的络合物最稳定,这是因为这些阳离子的电荷密度较高。N- 烷基硝基苯并-15-冠醚-5 对碱土金属阳离子的络合能力与硝基苯并-15-冠醚-5 的类似特性相当,而且远优于 N-(4-硝基苯基)氮杂-15-冠醚-5。
Crown ethers containing an amino group promise to be advantageous intermediates for the synthesis of chromogenic crown ethers, liquid crystal crown ethers and molecule acceptors.'-" Whereas monoaza-18-crown-6, monoaza15-crown-5, monoaza12-crown-4, and their variously N-substituted derivatives have been known for many years, 5-8 new methods for their preparation continue to a~pear.~9'O The preparation