Oxidation Strategy for the Synthesis of Regioisomeric Spiroisobenzofuranopyrroles: Facile Entries to Spiro[isobenzofuran-1,2′-pyrrole] and Spiro[isobenzofuran-1,3′-pyrrole] Derivatives
developed to synthesize two kinds of racemic spiroisobenzofuranopyrrole analogues as regioisomers. In the presence of sodiumperiodate, cis-indeno[1,2-b]pyrrol-4(1H)-ones were converted into spiro[isobenzofuran-1,2′-pyrrole] derivatives by a two-step process. In addition, oxidative reactions promoted by lead tetraacetate were demonstrated using cis-indeno[2,1-b]pyrrol-8(1H)-ones as substrates, affording
Isomerization of Ninhydrin-Heterocyclic Ketene Aminal Adducts: Kinetic versus Thermodynamic Control, Solvent Dependency and Mechanism
作者:Nanyang Chen、Minming Zou、Xue Tian、Fengjuan Zhu、Danping Jiang、Jiagao Cheng、Xusheng Shao、Zhong Li
DOI:10.1002/ejoc.201402677
日期:2014.10
Ninhydrin and heterocyclic ketene aminals (HKAs) are versatile building blocks in organic chemistry. Reactions of ninhydrin with HKAs initially produced the kinetic products indeno[1,2-b]pyrrol-4(1H)-one derivatives, which could further isomerize to thermodynamic counterparts indeno[2,1-b]pyrrol-8(1H)-ones. The isomerization showed a strong solvent dependency and occurred through a decomposition–reconstruction
Synthesis of methanesulfone-containing tetrasubstituted carbon stereocenters
作者:Wei Zhou、You-Ping Tian、Hao-Jie Zhou、Hui-Juan Wang、Yan Ren、Xiong-Li Liu
DOI:10.1039/d1ob00071c
日期:——
A methanesulfonylation reaction for the synthesis of sulfone-containing tetrasubstituted carbon stereocenters is described for the first time by simple treatment of indanedione–chromanone synthons with Et3N and easily accessible MsCl without any use of organometallic chemistry. This technology gave the corresponding valuable chromone-based 2-methanesulfonylated 1,3-indanediones in good yields (up to
Optical Properties of Spiroconjugated Charge-Transfer Dyes
作者:Przemyslaw Maslak、Anu Chopra、Christopher R. Moylan、Rüdiger Wortmann、Sonja Lebus、Arnold L. Rheingold、Glenn P. A. Yap
DOI:10.1021/ja9533003
日期:1996.1.1
donor part (aromatic diamine or amino thiol). The interaction between the donor and acceptor is controlled by the energy and symmetry of the frontier orbitals. The ground state dipole moments of these compounds are aligned along the long molecular axes. In the solid state, distortions of structures are observed that are consistent with partial electron shift from the donor to the acceptor. Much more
制备了一种新型分子内电荷转移染料。这些化合物中受体部分(1,3-茚二酮)的 LUMO 与供体部分(芳族二胺或氨基硫醇)的 HOMO 螺共轭。施主和受主之间的相互作用受前沿轨道的能量和对称性控制。这些化合物的基态偶极矩沿分子长轴排列。在固态下,观察到结构的畸变,这与从供体到受体的部分电子转移一致。在可见光谱区观察到的电子跃迁伴随着更明显的电子密度变化。这些跃迁属于电荷转移 (CT) 类型,如溶剂化变色和光电研究所示。激发态偶极矩的方向与基态的方向相反。这些观察结果与具有自由基离子对特征的激发态一致。新染料是模式...