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
Tetrahydroindeno[1′,2′:4,5]pyrrolo[1,2-<i>a</i>]imidazol-5(1<i>H</i>)-ones as Novel Neonicotinoid Insecticides: Reaction Selectivity and Substituent Effects on the Activity Level
作者:Nanyang Chen、Xiaoqing Meng、Fengjuan Zhu、Jiagao Cheng、Xusheng Shao、Zhong Li
DOI:10.1021/jf505281p
日期:2015.2.11
Tetraheterocyclic tetrahydroindeno[1',2':4,5]pyrrolo[1,2-a]imidazol-5(1H)-one derivatives as novel neonicotinoid candidates were designed and prepared by selective etherification, chlorination and esterification of ninhydrin-heterocyclic ketene aminals adducts. Some of the designed compounds showed excellent insecticidal activity against cowpea aphids (Aphis craccivora), brown planthopper (Nilaparvata lugens), and armyworm (Mythimna separata). In particular, the activity against armyworm (Mythimna separata) improved a lot in contrast with that of imidacloprid and cycloxaprid. The research here provides a novel neonicotinoid chemotype for further development.