(5-Imino-4,5-dihydro-3H-pyrrol-2-yl)amines as Sterically Restrained 1,3,5-Triazapenta-1,3-dienes: Useful Building Blocks for the Synthesis of Oligonitriles
作者:Edgar A. Marihart、Jan-Bernd Greving、Roland Fröhlich、Ernst-Ulrich Würthwein
DOI:10.1002/ejoc.200700469
日期:2007.10
(5-Imino-4,5-dihydro-3H-pyrrol-2-yl)amines 2 may be considered as sterically restrained 1,3,5-triazapenta-1,3-dienes. They were easily prepared from 2,2,3,3-tetramethylsuccinonitrile (1) and lithium amides with subsequent aqueous workup to give the monocyclic compounds 2a–d and the bi- and tricyclic compounds 2e–g. X-ray diffraction studies of 2c and 2d, which contain a primary NH2 group, reveal the
(5-Imino-4,5-dihydro-3H-pyrrol-2-yl) 胺 2 可以被认为是空间受限的 1,3,5-triazapenta-1,3-二烯。它们很容易由 2,2,3,3-四甲基丁二腈 (1) 和氨基锂制备,随后用水处理得到单环化合物 2a-d 和双环和三环化合物 2e-g。含有主要 NH2 基团的 2c 和 2d 的 X 射线衍射研究揭示了在固态中存在通过成对氢键结合在一起的同型二聚体。苯甲酰氯对锂化中间体 2a-Li 的捕获提供了获得 1-oxa-3,5,7-triazahepta-1,3,5-triene 3b 的途径。它的固态特征在于平面杂环亚单元和强烈扭曲的 N-酰脒部分。与 1-oxa-3,5-diazinium 盐 4,化合物 2a,b,d 或 2a-Li 反应得到 1-oxa-3,5,7,9,11-pentaazaundeca-1,3,5,7,9-戊烯 5a–