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Synthesis and characterization of (-)-menthyl containing N-alkyl cycloimmonium salts

机译:含(-)-薄荷基的N-烷基环亚铵盐的合成与表征

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摘要

The reaction of 4-phenyl-2-aminothiazole or 2-amino pyridine with α-bromo acetic (-)-menthyl ester (2c) yields new N-alkyl cycloimmonium bromides (1c, 3) with the chiral (-)-menthyl substituent, which were isolated and fully characterized by ~1H and ~(13)C NMR spectroscopy for the first time. In addition, starting from 4-phenyl-2-aminothiazole, two further N-alkyl cycloimmonium bromides (1a, 1b) were prepared. The molecular and crystal structures of all three thiazole derived N-alkyl cycloimmonium bromides (1a-c) were determined by single-crystal X-ray diffraction. In all cases the crystal structures are dominated by N-H?Br hydrogen bonds, which results in the formation of an extensive hydrogen bonded network in the crystal. Interestingly, in all structures S?Br - distances shorter than the sum of the van der Waals radii are observed.
机译:4-苯基-2-氨基噻唑或2-氨基吡啶与α-溴乙酸(-)-薄荷基酯(2c)的反应产生了具有手性(-)-薄荷基取代基的新的N-烷基环亚溴化铵(1c,3)分离,并首次通过〜1H和〜(13)C NMR光谱进行了全面表征。另外,从4-苯基-2-氨基噻唑开始,制备了另外两个N-烷基环溴化铵(1a,1b)。通过单晶X射线衍射测定所有三种噻唑衍生的N-烷基环溴化铵(1a-c)的分子和晶体结构。在所有情况下,晶体结构都以N-H2Br氢键为主,这导致在晶体中形成广泛的氢键网络。有趣的是,在所有结构中,观察到的距离S?Br-比范德华半径之和短。

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