A general and practicable synthesis of polycyclic heteroaromatic compounds. Part 4. A rationale for the mechanism of the synthesis
作者:Janet L. Asherson、Orhan Bilgic、Douglas W. Young
DOI:10.1039/p19810003041
日期:——
para-rearrangement which is known to occur in acid conditions. Aniline Mannich bases (29) are converted to benz[a]acridines (30) in an intermolecular reaction. The synthesis appears to be restricted to substrates where the putative intermediate (9) is not part of an amide group. In the course of these studies effective syntheses of the tricyclic compounds (24) and (25) have been discovered.
关于我们一般合成多环杂芳族化合物的机理方面的研究表明,遵循方案2中概述的反应序列。在我们的合成条件下,邻位重排(8)→(9)优于已知在酸性条件下发生的对位重排。在分子间反应中,苯胺曼尼希碱(29)被转化为苯并[ a ] r啶(30)。合成似乎仅限于推定的中间体(9)不属于酰胺基团的底物。在这些研究过程中,已经发现了三环化合物(24)和(25)的有效合成。
The Condensation of Cyclic Anhydrides with Schiff Bases. A Convenient Synthesis of 1,4,6-Triaryl-5-carboxy-2-oxo-1,2-dihydropyridines and 2,3-Diaryl-4-carboxy-1-oxo-1,2-dihydroisoquinolines
作者:M. S. Mayadeo、S. J. Kulkarni、K. D. Deodhar
DOI:10.1055/s-1990-26797
日期:——
Condensation of Schiff bases of o-hydroxyarenecarboxaldehydes with 3-arylpentenedioic or homophthalic acid anhydrides was found to give 1,4,6-triaryl-5-carboxy-2-oxo-1,2-dihydropyridines and 2,3-Diaryl-4-carboxy-1-oxo-1,2-dihydroisoquinolines, respectively, instead of the expected tetrahydro products. The Schiff bases (used in excess) oxidize the intermediate tetrahydro products to the title compounds.
Hofmann‐Martius‐Umlagerungen verschieden substituierter Anilin‐Derivate werden untersucht und die Spirocyclohexadienone 5 und 25 dargestellt. Im Vergleich zur N‐aliphatischen Spiroverbindung 9 zeigen 5 und 25 teilweise unterschiedliche Reaktionen, deren Ursache diskutiert wird.
Synthesis, IR spectral studies and quantum-chemical calculations on 1,2-dihydronaphto[1,2-e]oxazine-3-thiones and 3,4-dihydrobenzo[e][1,3]oxazine-2-thione
1 H NMR, IR spectroscopic data and elemental analyses. AM1, PM3 and abinitio (at Hartree-Fock level with 3-21G basis set) methods were used to study the molecular geometry of the compounds. A complete infrared spectral analysis of the oxazines has been performed in this paper. Observed frequencies of the molecules were compared with calculated normal mode analysis which was car- ried out on the basis
羟基-1-萘醛(1)与取代苯胺反应生成1-(取代苯基亚氨基甲基)萘)-2-醇(2)。用 NaBH4 还原这些亚胺得到 1-((取代的苯基氨基甲基)萘)-2-醇 (3),将其用硫光气环化得到相应的 2-取代的苯基-1,2-二氢萘(1,2-e)恶嗪-3-硫酮 (4)。3-对甲苯基-3,4-二氢苯并(e)(1,3)恶嗪-2-硫酮(8)也通过同样的方式得到。这些新化合物的结构由 1 H NMR、IR 光谱数据和元素分析确定。AM1、PM3 和 ab initio(在 Hartree-Fock 水平,具有 3-21G 基组)方法用于研究化合物的分子几何形状。本文对恶嗪进行了完整的红外光谱分析。将观察到的分子频率与基于 RHF/3-21G 方法进行的计算正常模式分析进行比较。振动带的分配(在 1760-400 cm i1 的范围内)已经通过考虑从头振动分析的结果来执行。通过半经验 AM1 和 ab initio
Naidu, M. S. R.; Prasad, M. V. S. R., Journal of the Indian Chemical Society, 1992, vol. 69, # 10, p. 686 - 688