合成了标题化合物,并研究了它们在溶液中(NMR和DFT),在气相(DFT)中以及对于其中一些在固态(X射线)中的结构和构象行为。使用可变温度NMR光谱确定八元环的构象平衡和构象变化的活化能。聚结效应被分配给手性基态构象的外消旋化,该手性基态构象在38–100 kJ mol –1的范围内具有环反转势垒,这取决于两个强构象约束条件的相对设置:苯并环化和酰胺功能。第二个构象过程,即苯并[ c ]偶氮素-3-one,苯并[观察到d ]偶氮星-2-酮和苯并[ d ]偶氮星-4-酮。通过分析实验数据和计算得出的NMR数据,阐明了溶液中观察到的构象异构体的性质。结合先前关于(Z,Z)-环辛二烯及其苯并类似物的实验和理论数据讨论了目前的结果。
Two-Carbon Ring Expansion of 1-Indanones via Insertion of Ethylene into Carbon–Carbon Bonds
作者:Ying Xia、Shusuke Ochi、Guangbin Dong
DOI:10.1021/jacs.9b07445
日期:2019.8.21
A rhodium-catalyzed direct insertion of ethylene into a relatively unstrained carbon-carbon bond in 1-indanones is reported, which provides a two-carbon ring-expansion strategy for preparing seven-membered cyclic ketones. As many 1-indanones are commercially available and ethylene is inexpensive, this strategy simplifies synthesis of benzocycloheptenones that are valuable synthetic intermediates for
A set of GluN2B NMDAreceptorantagonists with conformationally restricted phenylethylamine substructure was prepared and pharmacologicallyevaluated. The phenylethylamine substructure was embedded in ring expanded 3-benzazocines 4 as well as ring-contracted tetralinamines 6 and indanamines 7. The ligands 4, 6 and 7 were synthesized by reductive alkylation of secondary amine 11, reductive amination
were synthesized, and their structure and conformational behavior in solution (NMR and DFT), in the gas phase (DFT), and, for some of them, in the solid state (X-ray) were investigated. The variable-temperature NMR spectra were employed to determine the conformational equilibria and the activation energy of the conformational changes of the eight-memberedring. The coalescence effects are assigned to
合成了标题化合物,并研究了它们在溶液中(NMR和DFT),在气相(DFT)中以及对于其中一些在固态(X射线)中的结构和构象行为。使用可变温度NMR光谱确定八元环的构象平衡和构象变化的活化能。聚结效应被分配给手性基态构象的外消旋化,该手性基态构象在38–100 kJ mol –1的范围内具有环反转势垒,这取决于两个强构象约束条件的相对设置:苯并环化和酰胺功能。第二个构象过程,即苯并[ c ]偶氮素-3-one,苯并[观察到d ]偶氮星-2-酮和苯并[ d ]偶氮星-4-酮。通过分析实验数据和计算得出的NMR数据,阐明了溶液中观察到的构象异构体的性质。结合先前关于(Z,Z)-环辛二烯及其苯并类似物的实验和理论数据讨论了目前的结果。