Transannular Hydrogen Bonding in Planar‐Chiral [2.2]Paracyclophane‐Bisamides

Transannular Hydrogen Bonding in Planar‐Chiral [2.2]Paracyclophane‐Bisamides
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平面手性中的跨环氢键 [2.2] 对环芳烷双酰胺

DOI:
10.1002/hlca.201900047
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发表时间:
2019
影响因子:
1.8
通讯作者:
Castellano, Ronald K.
Castellano, Ronald K.
中科院分区:
化学4区
文献类型:
--
作者:
Henderson, Will R.;Fagnani, Danielle E.;Grolms, Jonathan;Abboud, Khalil A.;Castellano, Ronald K.

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为了更好地理解基于[2.2]对环芳烷的分子识别单元的跨环氢键,设计、合成和表征了一系列[2.2]对环芳烷-双酰胺区域异构体和烷基化比较物。 X射线晶体学表明,跨环氢键在固态下得以维持,但没有观察到立体特异性自识别。跨环和分子间氢键 N−H 拉伸的分配可以通过红外光谱进行,并且通过非极性溶剂中的 1 H-NMR 观察跨环氢键对酰胺键旋转动力学的影响。通过比较烷基化和非烷基化的假邻4,12-[2.2]对环芳烷双酰胺,观察跨环氢键对[2.2]对环芳烷光学性质的影响。最后,通过相应的亚磺酰基非对映异构体实现了4-单-[2.2]对环芳烷和伪邻4,12-[2.2]对环芳烷双酰胺的光学拆分,用于圆二色性研究。 [2.2]对环芳酰胺中的跨环氢键允许预组织以进行自互补分子间组装,但其强度足以允许酰胺快速旋转,即使在非极性溶剂中也是如此。
A series of [2.2]paracyclophane‐bisamide regioisomers and alkylated comparators were designed, synthesized, and characterized in order to better understand the transannular hydrogen bonding of [2.2]paracyclophane‐based molecular recognition units. X‐Ray crystallography shows that transannular hydrogen bonding is maintained in the solid‐state, but no stereospecific self‐recognition is observed. The assignment of both transannularly and intermolecularly hydrogen bonded N−H stretches could be made by infrared spectroscopy, and the effect of transannular hydrogen bonding on amide bond rotation dynamics is observed by1H‐NMR in nonpolar solvents. The consequences of transannular hydrogen bonding on the optical properties of [2.2]paracyclophane is observed by comparing alkylated and non‐alkylatedpseudo‐ortho4,12‐[2.2]paracyclophane‐bisamides. Finally, optical resolution of 4‐mono‐[2.2]paracyclophane andpseudo‐ortho4,12‐[2.2]paracyclophane‐bisamides was achieved through the corresponding sulfinyl diastereoisomers for circular dichroism studies. Transannular hydrogen bonding in [2.2]paracyclophane‐amides allows preorganization for self‐complementary intermolecular assembly, but is weak enough to allow rapid rotation of the amides even in nonpolar solvents.
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