An efficient and concise route for the construction of thiochromene based oxahelicenes in which heteroatoms are located on the outer helix through base-induced ring transformation of 4-sec.amino-2-oxo-2,5-dihydrothiochromeno[4,3-b]pyran-3-carbonitriles by thiochroman-4-one, 1-indanone and 2-indanone separately has been described. The X-ray studies for P and 4a show the formation of supramolecular structures through weak C–H⋯O and C–H⋯N intermolecular interactions. Supramolecular chains in 6a through C–H⋯N and π⋯π and in 7via C–H⋯π and π⋯π weak and intermolecular interactions have been observed. The detail analyses of Hirschfeld surface and fingerprint plots gave a comparative picture of the modes of non-covalent interactions in the newly synthesized compounds. The stabilization energies associated with these weak interactions have been estimated using DFT and AIM theory calculations.
已描述了一种高效简洁的合成路线,通过碱诱导环转化4-sec-
氨基-2-氧基-2,5-二氢
噻唑烯[4,3-b]
吡喃-3-
氰基,与
噻唑烯-4-酮、
1-茚酮和
2-茚酮单独反应,构建了外层螺旋上带有杂原子的噻烯基氧螺旋。P和4a的X射线研究显示,通过弱的C–H⋯O和C–H⋯N分子间相互作用形成超分子结构。在6a中观察到通过C–H⋯N和π⋯π的超分子链,而在7中则通过C–H⋯π和π⋯π的弱分子间相互作用。对Hirschfeld表面和指纹图的详细分析提供了一幅新合成化合物中非共价相互作用模式的比较图。利用DFT和AIM理论计算估算了与这些弱相互作用相关的稳定化能。