Synthesis of novel chiral tetra-(hydrazinecarboxamide) cyclophane macrocycles
作者:Hany F. Nour、Agnieszka Golon、Nikolai Kuhnert
DOI:10.1016/j.tetlet.2013.05.085
日期:2013.8
A novel class of chiral enantiomerically pure C-2-symmetric polyamide macrocycles has been synthesized from the reaction of chiral dioxolane dicarbohydrazides, obtained from commercially available tartaric acid, and aromatic diisocyanates. The novel macrocycles form in almost quantitative yields in a chemoselective [2+2]-cyclocondensation reaction under conformational bias of the dicarbohydrazides. The reaction takes place in anhydrous THF at a relatively high concentration of reactants without addition of external templates or application of high dilution conditions. The structures of the novel polyamide macrocycles were verified and fully assigned by H-1 NMR, C-13 NMR, 2D ROESY NMR, 2D HMBC, 2D HMQC, DEPT 135, FT IR, and CD spectroscopy. (C) 2013 Published by Elsevier Ltd.
Synthesis of novel chiral bis-N-substituted-hydrazinecarboxamide receptors and probing their solution-phase recognition to chiral carboxylic guests by ESI-TOF/MS and tandem ESI-MS
作者:Hany F. Nour、Agnieszka Golon、Tuhidul Islam、Marcelo Fernández-Lahore、Nikolai Kuhnert
DOI:10.1016/j.tet.2013.11.002
日期:2013.12
excellent yields by reacting chiral dicarbohydrazides, obtained from commercially available tartaric acid, with substituted aromatic isocyanates. The newly synthesized hydrazinecarboxamides formed structurally unique supramolecular aggregates, which have been confirmed by ESI-TOF/MS and tandem ESI-MS. They also showed molecular recognition to a selection of chiral carboxylic guests and oligopeptides, which
通过使得自市售酒石酸的手性二碳酰肼与取代的芳族异氰酸酯反应,以良好至优异的产率合成了七个新颖的双-N-取代的肼基羧酰胺受体。新合成的肼甲酰胺形成了结构独特的超分子聚集体,这已由ESI-TOF / MS和串联ESI-MS证实。他们还显示了对手性羧酸客体和寡肽的选择的分子识别,它们模拟了细菌细胞壁的骨架结构。通过包括FTIR,1 H NMR,13 C NMR,ESI-TOF / MS,串联ESI-MS,2D ROESY NMR和CD光谱在内的各种光谱技术验证了新化合物的结构。
Synthesis of novel enantiomerically pure tetra-carbohydrazide cyclophane macrocycles
作者:Hany F. Nour、Nadim Hourani、Nikolai Kuhnert
DOI:10.1039/c2ob25171j
日期:——
A total of twelve novelenantiomericallypure tetra-carbohydrazide cyclophane macrocycles have been synthesised in quantitative yields by reacting chiral (4R,5R)- and (4S,5S)-1,3-dioxolane-4,5-dicarbohydrazides with aromatic bis-aldehydes in a [2 + 2]-cyclocondensation reaction. The compounds show a dynamic behaviour in solution, which has been rationalized in terms of an unprecedented conformational