A Facile One-Pot Three-Component Synthesis of Macrocyclic Imidazolidines by [3+2] Cycloaddition Reaction of Azomethine Ylides
作者:Raghavachary Raghunathan、Subban Kathiravan
DOI:10.1055/s-0029-1216631
日期:2009.4
One-potthree-componentsynthesis of novel macrocyclic imidazolidines has been accomplished in good yields via a facile [3+2] cycloaddition reaction of azomethine ylide, derived from paraformaldehyde and sarcosine, with various macrocyclic imines as dipolarophiles. The effect of solvent on the [3+2]-dipolar cycloaddition reaction is also studied.
C-Branched chiral (racemic) macrocyclic amino acids: structure of their Ni(ii), Zn(ii) and Cu(ii) complexes
作者:Daniel Pellico、Mar Gómez-Gallego、Rosa Escudero、Pedro Ramírez-López、Montserrat Oliván、Miguel A. Sierra
DOI:10.1039/c1dt10539f
日期:——
A new procedure for the synthesis of macrocyclic embedded bis-α-amino acids and their use as cation-ligands is described. These compounds are able to form stable Cu(II), Zn(II) and Ni(II) complexes as long as they have a flexible tether between the two nitrogen atoms. For a given macrocycle, the X-ray diffraction studies revealed diastereomerically pure complexes having different geometries depending
Synthesis of 15-, 16-, and 17-Membered Bis-C-Pivot Macrocycles Consisting of N<sub>2</sub>O<sub>2</sub>Donor-Type Crown Ethers and Dialkyl Phosphonates
作者:Selen Bilge Koçak、Hale Üçkardeş
DOI:10.1002/hc.21054
日期:2012.11
Bis-C-pivotmacrocycles containing aminophosphonate functions (5–10) have been synthesized and characterized by elemental analysis, FTIR, MS, 1D 1H, 13C and 31P NMR, and 2D HETCOR techniques. The phosphorylation reaction of dibenzo-bis-imino crownethers (1–4) with dimethyl and diethyl phosphite used here has the potential to provide bis-C-pivotmacrocycles (5–10), which possess two stereogenic C-centers
已经合成了含有氨基膦酸酯官能团 (5-10) 的双 C 枢轴大环,并通过元素分析、FTIR、MS、1D 1H、13C 和 31P NMR 以及 2D HETCOR 技术进行了表征。二苯并双亚氨基冠醚 (1-4) 与此处使用的亚磷酸二甲酯和二乙酯的磷酸化反应有可能提供双 C 枢轴大环 (5-10),其具有两个立体 C 中心,从而产生非对映异构体(内消旋和外消旋)。根据化学位移、信号强度、自旋-自旋耦合常数和分裂模式,报告了化合物的内消旋和外消旋形式的详细光谱归属。bis-C-pivot 大环 (5-10) 可以作为一类潜在的超分子宿主分子。
REACTION OF COMPOUNDS WITH A H-P BOND WITH SCHIFF-BASES
作者:Jian Rohovec、Pavel Vojtíšek、Ivan Lukeš
DOI:10.1080/10426509908037002
日期:1999.5.1
with a P-H bond to Schiff bases of both simple and macrocyclic compounds proceeds smoothly as a non catalysed thermally initialised reaction in an inert solvent. For macrocyclic systems and bulky phosphorus substituents a stereoselective formation of the trans isomer was confirmed by X ray analysis. The addition is reversible, and the reverse reaction is catalysed by Lewis acids. The trans orientation
摘要 具有 PH 键的化合物与简单和大环化合物的席夫碱的加成作为惰性溶剂中的非催化热初始化反应顺利进行。对于大环系统和庞大的磷取代基,通过 X 射线分析证实了反式异构体的立体选择性形成。加成是可逆的,逆反应由路易斯酸催化。大环上磷取代基的反式取向、分子的立体化学刚性和加成的可逆性限制了以这种方式形成的化合物作为配体的用途。
Grimsley,P.G. et al., Australian Journal of Chemistry, 1977, vol. 30, p. 2095 - 2098