An unexpected pentacarbonyl chromium complexation of a cyano group of the ABC core of cephalotaxine
摘要:
A new penta-carbonyl chromium(0) complex of the type [Cr(CO)(5)(L)] (L = tetracyclic pyrrolobenzazepine unit 3) was surprisingly obtained by reacting [Cr(CO)(3)(naphthalene)] or [Cr(CO)(3)(tmtach)] with the tetracyclic pyrrolobenzazepine unit 3 in octane-ether/THF-solvent mixtures or acetone under ambient temperature or reflux. The new complex 13 has been characterized by spectral analysis including IR, H-1 and C-13 NMR data. For comparison purposes, the safrole-tricarbonyl chromium(0) complex 12 was prepared and characterized. X-ray diffraction analyses of both complexes were determined. Based on the above data, an octahedral structure has been assigned to the new complex 13. (C) 2014 Elsevier B.V. All rights reserved.
An unexpected pentacarbonyl chromium complexation of a cyano group of the ABC core of cephalotaxine
作者:Laith Quteishat、Armen Panossian、Franck Le Bideau、Rana Alsalim、Pascal Retailleau、Claire Troufflard、Eric Rose、Françoise Dumas
DOI:10.1016/j.jorganchem.2014.10.040
日期:2015.1
A new penta-carbonyl chromium(0) complex of the type [Cr(CO)(5)(L)] (L = tetracyclic pyrrolobenzazepine unit 3) was surprisingly obtained by reacting [Cr(CO)(3)(naphthalene)] or [Cr(CO)(3)(tmtach)] with the tetracyclic pyrrolobenzazepine unit 3 in octane-ether/THF-solvent mixtures or acetone under ambient temperature or reflux. The new complex 13 has been characterized by spectral analysis including IR, H-1 and C-13 NMR data. For comparison purposes, the safrole-tricarbonyl chromium(0) complex 12 was prepared and characterized. X-ray diffraction analyses of both complexes were determined. Based on the above data, an octahedral structure has been assigned to the new complex 13. (C) 2014 Elsevier B.V. All rights reserved.
Crystallographic/Experimental Electron Density Characterizations and Reactions with Nucleophiles of β-Enaminonitriles Possessing a Pyrrolobenzazepine Core
addition of various nucleophilic reagents to [ABC] subunits 2 and 7 possessing a pyrrolobenzazepine core. In fact, this reaction implicates invariably the carbonyl group of 2. Regarding the reaction of 7 with nucleophiles, the most striking aspect is the complete lack of reactivity of the enaminonitrile moiety. For instance, the condensation of 7 with methylmagnesium bromide involves exclusively the cleavage