Scaffold-Divergent Synthesis of Ring-Fused Indoles, Quinolines, and Quinolones via Iodonium-Induced Reaction Cascades
摘要:
N-(2-lodophenyl)imines A are readily formed from Schiff's base condensation of 2-iodoanilines with carbonyls and ketals. These imines provide useful substrates in scaffold-divergent synthesis through the attachment of an alkyne (Songashira coupling or acyl substitution of a Weinreb amide) followed by an iodonium-induced reaction cascade to give ring-fused indoles B, quinolines C, or quinolones D depending on the reaction conditions employed.
Acid‐Mediated Condensation of 2‐Aminoaryl Cyclopropyl Ketones with Aldehydes for the Synthesis of 2,3‐Dihydrofuro[3,2‐c]quinolines
作者:Wenbo Cai、Cong Zhang、Xin Wang、Chuanjun Song
DOI:10.1002/adsc.202400263
日期:2024.6.10
A method for the synthesis of 2,3-dihydrofuro[3,2-c]quinolines via TfOH or TMSOTf mediated condensation of 2-aminoaryl cyclopropyl ketones with aldehydes has been developed. The reaction proceeds under transition metal or halogen free conditions, giving access to the target molecules in 27-90% isolated yields. Mechanistic study indicates that the reaction sequence involves imine formation, intramolecular
An efficient Ru-catalyzed synthesis of dihydrofuroquinolines from azido-cyclopropyl ketones via the reduction-cyclization-rearrangement process is reported. A plausible reaction mechanism for this process is depicted. Additionally, when the reaction was carried out under H-2 (1 atm) In the presence of Pd/C, 4-quinolones were obtained in excellent yields.
Alternating Iodonium-Mediated Reaction Cascades Giving Indole- And Quinoline-Containing Polycycles
作者:Rosliana Halim、Peter J. Scammells、Bernard L. Flynn
DOI:10.1021/ol800202u
日期:2008.5.1
A simple two-step convergent protocol gives direct access to synthetic intermediate A from ortho-iodoanilines. Intermediate A can be treated with NIS in CH(2)Cl(2) to induce novel iodonium mediated domino reaction cascade, which provides direct access to ring-fused indole compounds B. Simply by changing the reaction conditions, this protocol can be directed down an alternative domino reaction cascade to give various ring fused quinoline compounds C.
Synergistic Effect of Pd(II) and Acid Catalysts on Tandem Annulation Reaction for the Regioselective Synthesis of Ring-Fused Quinolines