A Novel Synthesis of 2,3-Dihydro-1,3-methano-1<i>H</i>-indene {(Bicyclo[2.1.1]hexeno)benzene} and Analysis of Its NMR Spectra
作者:Manfred Christl、Carsten Cohrs
DOI:10.1002/ejoc.201500831
日期:2015.10
A new synthesis of 2,3-dihydro-1,3-methano-1H-indene (3) has been designed with bicyclo[2.1.1]hex-2-ene serving as starting material, which was added onto chloro-substituted α-pyrones. The title hydrocarbon 3 was then obtained in two subsequent steps. The AA′MM′ 1H NMR spectrum of 3 was analyzed and simulated, leading to corrections of previously published coupling constants. The 13C NMR signal of
以双环[2.1.1]己-2-烯为起始原料,加入氯代α-茚,设计了2,3-二氢-1,3-甲氧基-1H-茚(3)的新合成方法-吡喃酮。然后在两个后续步骤中获得标题烃3。对 3 的 AA'MM' 1H NMR 谱进行了分析和模拟,从而修正了先前公布的耦合常数。亚甲基碳原子的 13C NMR 信号出现在特别低的场 (δ = 63.3 ppm)。这一发现与环丁烷的亚甲基碳原子和双环 [1.1.0] 丁烷的桥头碳原子的异常低场和高场吸收一起讨论,其 1,3- 和 2,4- 位分别为由 π 电子系统桥接。结果,具有 (4n + 2) π 电子的部分会导致去屏蔽,