已经开发了一种无金属的光催化策略,用于在廉价的NH 4 SCN中以氮化碳(gC 3 N 4)作为绿色溶剂中的普通多相催化剂,在空气气氛下和蓝色LED的照射下制备硫氰化杂环。各种硫氰酸盐杂环,包括吲哚[2,1- a ]异喹啉-6(5 H)-one,苯并咪唑并[2,1- a ]异喹啉-6(5 H)-one,硫代黄酮,氮杂螺[4.5]三烯酮和咪唑[ 1,2-一以高产率(高达96%)成功合成了]吡啶。重要的是,这种无金属和无外部氧化剂的方法使用碳酸二甲酯作为绿色介质,避免了传统的挥发性有机溶剂。此外,可循环使用的gC 3 N 4催化剂可使用至少8次,而不会显着降低活性。
Step and redox efficient nitroarene to indole synthesis
作者:Bünyamin Özkaya、Christina L. Bub、Frederic W. Patureau
DOI:10.1039/d0cc03258a
日期:——
priority in synthetic method development, in order to make synthetic processes more sustainable and more affordable. Herein, a step and redox efficient nitroarene to indolesynthesis is developed, in sharp contrast to the rich literature on the construction of indoles. Elemental zinc was found to be the best terminal reductant.
Rh-Catalyzed oxidative C–H activation/annulation: converting anilines to indoles using molecular oxygen as the sole oxidant
作者:Guoying Zhang、Hui Yu、Guiping Qin、Hanmin Huang
DOI:10.1039/c3cc49751h
日期:——
A practical and efficient Rh(III)-catalyzed aerobic C-Hactivation has been developed for the facile synthesis of a broad range of indoles from simple anilines and alkynes. The protocol could be conducted under mild conditions and used environmentally friendly oxygen as the sole clear oxidant.
Dehydrative coupling between indoles and isatins provided indolylindolinones in good yields as novel dyes with wide-range absorption due to intramolecular charge-transfer interactions. The HOMO and LUMO levels of indolylindolinones could be manipulated individually by the introduction of substituents on the indole and isatin units, respectively. Indolylindolinones served as a bidentate ligand to Ni(II) and Cu(II) ions to provide stable metal complexes. Metal coordination induced large bathochromic shift of the lowest-energy absorption band to the near-infrared region.