The symmetrical tetraaza heptacyclic alkaloid eilatin (1) was synthesized in a biomimetic two step reaction from catechol and monotrifluoro kynuramine (6) under oxidative conditions in the first step (aq, EtOH, NaIO3) and basic conditions (ammoniacal MeOH, DMAP) in the second. Two other unsuccessful approaches, one leading to 7-phenylascididemin, are described.
A divergent approach to the total synthesis of the marine pyridoacridine alkaloid eilatin and its synthetic isomer isoeilatin
作者:Alois Plodek、Franz Bracher
DOI:10.1016/j.tetlet.2015.01.176
日期:2015.3
Herein we report the totalsynthesis of the heptacyclic pyridoacridine alkaloid eilatin (1) and its synthetic isomer isoeilatin (2). Starting from readily available 9-methyl-3,4-dihydroacridin-1(2H)-one (5) and 2-aminoacetophenone, a divergent synthesis gave alkaloid 1 in seven, and isomer 2 in eight steps.
Pairing of Propellers: Dimerization of Octahedral Ruthenium(II) and Osmium(II) Complexes of Eilatin via π−π Stacking Featuring Heterochiral Recognition
作者:Dalia Gut、Amira Rudi、Jacob Kopilov、Israel Goldberg、Moshe Kol
DOI:10.1021/ja012636b
日期:2002.5.1
equilibrium, and the structures of the dimers in acetonitrile solution are proposed to be analogous to their solid-statestructures. Dimerization constants in acetonitrile were measured for the five racemic eilatin complexes that exhibit different structural parameters, as well as for the two enantiomeric forms of one of these complexes. They were found to be independent of the metal (Ru vs Os), strongly
合成了 [M(LL)(2)(eilatin)](2+)(M = Ru,Os;LL = 联吡啶型配体)的五个八面体 eilatin 配合物,并研究了它们通过 pi-pi 堆积的二聚化通过晶体学和 (1) H NMR 技术。解析了这些外消旋复合物的 X 射线结构,并揭示了 eilatin 复合物被组织为离散的二聚体,其中每个复合物的 eilatin 残基堆积在中心对称堆积中。(1) H NMR 光谱中浓度的化学位移依赖性支持快速二聚体-单体平衡,并且乙腈溶液中的二聚体结构被认为类似于它们的固态结构。测量了五种具有不同结构参数的外消旋蛋白复合物在乙腈中的二聚常数,以及这些复合物之一的两种对映体形式。发现它们独立于金属(Ru 与 Os),强烈依赖于由 LL 配体(2,2'-联吡啶、1,10-菲咯啉、2,9-二甲基-1,10-菲咯啉和 2,2'-二喹啉),并取决于配合物的光学纯度。证明了对异手性比同
Effective chiral recognition among ions in polar media
作者:Sheba D. Bergman、Richard Frantz、Dalia Gut、Moshe Kol、Jérôme Lacour
DOI:10.1039/b516255f
日期:——
Effective homochiral recognition occurs between the cationic [Fe(eilatin)3]2+ complex and TRISPHAT anions even in polar media such as 90% acetone–CHCl3 (de ≥ 89%).
Eilatin as a Bridging Ligand in Ruthenium(II) Complexes: Synthesis, Crystal Structures, Absorption Spectra, and Electrochemical Properties
作者:Dalia Gut、Israel Goldberg、Moshe Kol
DOI:10.1021/ic020703c
日期:2003.6.1
elucidation of the complexes in solution was accomplished by 1D and 2D NMR techniques. The X-raystructures of the mononuclear complex 3 and of the two dinuclear complexes 4 and 5 were solved, and absorption spectra and electrochemical properties of the complexes were explored. Both dinuclear complexes formed as racemic mixtures in a 3:1 diastereoisomeric ratio, the major isomer being the heterochiral
Palladium Complexes Containing Large Fused Aromatic N−N Ligands as Efficient Catalysts for the CO/Styrene Copolymerization
作者:Sheba D. Bergman、Israel Goldberg、Carla Carfagna、Luca Mosca、Moshe Kol、Barbara Milani
DOI:10.1021/om060624z
日期:2006.12.1
Bis(homoleptic) palladium(II) complexes of the extended aromatic ligands eilatin ([Pd(eil)2][BF4]2 (1a)) and dipyridophenazine ([Pd(dppz)2][BF4]2 (2a), [Pd(dppz)2][PF6]2 (2b)) were synthesized and employed in the copolymerization of carbonmonoxide and styrene. The eilatin ligand in the complex [Pd(eil)2][BF4]2 is bound via its less hindered “head” coordination site. The X-ray structure of 2b was solved