4-c]quinolone derivatives were synthesized via domino Knoevenagel-hetero-Diels–Alder reactions of indoline-2-thions and novel N-acrylated anthranilaldehydes in refluxing ethanol as a solvent in the presence of 20 mol% ZnBr2 as a Lewisacid catalyst. All reactions proceed with high yields with excellent regio- and stereoselectivity.
在20 mol的乙醇存在下,通过吲哚-2-噻吩的多米诺胺Knoevenagel-杂Diels-Alder反应和新颖的N-丙烯酸蒽醛在回流的乙醇中合成了各种新型的[3,4- c ]喹诺酮衍生物。%ZnBr 2作为路易斯酸催化剂。所有反应均以高产率进行,具有优异的区域选择性和立体选择性。
Synthesis of novel pentacyclic thiopyrano indole-annulated benzo-δ-sultone derivatives via a domino Knoevenagel-hetero-Diels–Alder reaction in water
An efficient synthesis of novel pentacyclic thiopyrano indole-annulated benzo-δ-sultone derivatives is achieved via intramolecular dominoKnoevenagel-hetero-Diels–Alderreaction of 2-formylphenyl (E)-2-phenylethenyl sulfonates and indoline-2-thiones in aqueous medium. The products are formed in good yields with high regio- and stereoselectivity.
An efficient synthesis of polycyclic indole derivatives is achieved via domino Knoevenagel–hetero‐Diels–Alderreaction of O‐acrylated salicylaldehyde derivatives with dihydroindole‐2‐thiones in H2O as solvent. The products are formed in good‐to‐excellent yields with high regio‐ and stereoselectivity.
A straightforward approach for the synthesis of novel fused thiopyrano [2, 3-b] indole derivatives from the Intramolecular Friedel-Crafts acylation
作者:Salman Taheri、Ali Asghar Mohammadi、Reza Ahdenov、Robab Azarlak、Saeed K. Amini、Mohammad Reza Halvagar
DOI:10.1016/j.molstruc.2020.127854
日期:2020.5
regioselective synthesis of fused thiopyrano [2,3-b]indole-2-carboxylates using Eaton’s reagent (P2O5/MeSO3H) as an inexpensive, and easily available catalyst is developed under solvent-free condition at 80C. The reaction of various acetylenecarboxylates and indoline-2-(3H)-thiones using Eaton’s reagent affords fused indole heterocycliccompounds in good to excellent yields. This new method Compared
Asymmetric Construction of Spiro[thiopyranoindole-benzoisothiazole] Scaffold via a Formal [3 + 3] Spiroannulation
作者:Xiang Chen、Jun-Qi Zhang、Shao-Jie Yin、Hai-Yan Li、Wei-Qun Zhou、Xing-Wang Wang
DOI:10.1021/acs.orglett.5b01951
日期:2015.9.4
An enantioselective formal thio[3 + 3] spiroannulation reaction of indoline-2-thiones to 1-azadienes has been developed by the use of a quinine-derived bifunctional tertiary amine-thioureacatalyst, which furnished a series of optically active spiro[thiopyranoindole-benzoisothiazole] heterocycles with a spiro quaternary C–N/C–S stereogenic centers in high yields with good to excellent diastereo- and