Synthesis and X-ray crystallographic analysis of free base and hexafluorophosphate salts of 3,4-dihydroisoquinolines from the Bischler–Napieralski reaction
作者:Carlos E. Puerto Galvis、Cristian C. Granados、Vladimir V. Kouznetsov、Mario A. Macías
DOI:10.1039/d0nj05235c
日期:——
employed, but the respective 3,4-dihydroisoquinolines, as hexafluorophosphate salts, were obtained when [bmim]PF6 was used as a reaction medium due to an anion metathesis between the reaction intermediates and the solvent. A full X-ray crystallographic analysis of a 1-phenethyl-3,4-dihydroisoquinoline derivative is reported for the first time and reveals that, in this core, as a free base, the C10–N1–C9–C8
研究了N-苯基乙基肉桂酰胺的Bischler-Napieralski反应在乙腈和1-丁基-3-甲基咪唑六氟磷酸盐([bmim] PF 6)中的作用。观察到对分离产物的性质的强烈影响,这取决于原料的结构和所用溶剂。当使用乙腈时,分离出了相应的3,4-二氢异喹啉作为游离碱,但是当[bmim] PF 6时,得到了相应的3,4-二氢异喹啉作为六氟磷酸盐。由于反应中间体和溶剂之间存在阴离子复分解反应,因此将其用作反应介质。首次报道了对1-苯乙基-3,4-二氢异喹啉衍生物的完整X射线晶体学分析,结果表明,在该核中,作为游离碱,C10–N1–C9–C8扭转角使存在两个构象体,并在一个中心对称的P 2 1 / n空间群中结晶。然而,在六氟磷酸盐中仅结晶了一个构象异构体,因此描述了一个对映体的P 6 1空间基团。不存在II型对称操作的允许包含PF 1D-通道的形成6 -阴离子并沿[001]方向穿过整个结构,