Synthesis of pyrrolo-[2,1-j]quinolone framework via intramolecular electrophilic ipso-cyclization
摘要:
The challenging pyrrolo-12,1-j]quinolone core structure has been synthesized from N-(alkynoyl)-6-methoxytetrahydroquinoline in good yields using electrophilic cyclization as the key step. These reactions require simple starting materials and mild reaction conditions. In addition, we have demonstrated that the iodine moiety, which could be easily introduced in the final step, is very useful for further functionalization by employing various palladium-catalyzed cross-coupling reactions. (C) 2012 Elsevier Ltd. All rights reserved.
Synthesis of pyrrolo-[2,1-j]quinolone framework via intramolecular electrophilic ipso-cyclization
摘要:
The challenging pyrrolo-12,1-j]quinolone core structure has been synthesized from N-(alkynoyl)-6-methoxytetrahydroquinoline in good yields using electrophilic cyclization as the key step. These reactions require simple starting materials and mild reaction conditions. In addition, we have demonstrated that the iodine moiety, which could be easily introduced in the final step, is very useful for further functionalization by employing various palladium-catalyzed cross-coupling reactions. (C) 2012 Elsevier Ltd. All rights reserved.
Ag-Catalyzed Oxidative <i>ipso</i>-Cyclization via Decarboxylative Acylation/Alkylation: Access to 3-Acyl/Alkyl-spiro[4.5]trienones
作者:Chada Raji Reddy、Dattahari H. Kolgave、Muppidi Subbarao、Mounika Aila、Santosh Kumar Prajapti
DOI:10.1021/acs.orglett.0c01588
日期:2020.7.17
A strategy to functionalized spiro[4.5]trienones, by domino silver-catalyzed decarboxylative acylation or alkylation/ ipso-cyclization of N-arylpropiolamides with α-ketoacids/alkyl carboxylic acids, is presented. This transformation offers a wide range of substituted 3-acyl/alkyl-spiro[4.5]trienones in high yields with a broad substrate scope. The approach was further extended to access fused tricyclic
Na
<sub>2</sub>
S
<sub>2</sub>
O
<sub>8</sub>
‐Promoted Radical Cyclization for the Synthesis of Azaspiro[4.5]deca‐3,6,9‐triene‐2,8‐dione and Pyrrolo[2,1‐
<i>j</i>
]quinolone Derivatives
An efficient radicalcyclization of N‐(4‐methoxyphenyl)‐N‐methyl‐3‐phenylpropiolamides with 1‐phenylcyclopropan‐1‐ols has been achieved using Na2S2O8 to produce azaspiro[4.5]deca‐3,6,9‐triene‐2,8‐diones. Similarly, the reaction of 1‐[6‐methoxy‐3,4‐dihydroquinolin‐1(2H)‐yl]‐3‐phenylprop‐2‐yn‐1‐ones with 1‐phenylcyclopropan‐1‐ols gives 6,7‐dihydro‐3H‐pyrrolo[2,1‐j]quinoline‐3,9(5H)‐diones.
使用Na 2 S 2 O 8生成氮杂螺[4.5] deca-3,6,可以有效地将N-(4-甲氧基苯基)-N-甲基-3-苯基丙酰胺与1-苯基环丙烷-1-醇进行自由基环化。9-三烯-2,8-二酮。同样,1- [6-甲氧基-3,4-二氢喹啉-1(2 H)-基] -3-苯基丙-2-炔-1-酮与1-苯基环丙-1-醇的反应得到6,7二氢-3- ħ吡咯并[2,1- Ĵ ]喹啉-3,9-(5 ħ) -二酮。
Expeditious Access to Spiro-Fused 2,5-Cyclohexadienones <i>via</i> Thio(seleno)cyanative <i>ipso</i>-Cyclization
作者:Chada Raji Reddy、Uprety Ajaykumar、Dattahari H. Kolgave
DOI:10.1021/acs.joc.0c02270
日期:2020.12.4
A facile oxidative dearomatization of N-(p-methoxyaryl)propiolamides has been established for the synthesis of spiro-fused 2,5-cyclohexadienone frameworks via thio(seleno)cyanative ipso-cyclization in the presence of cericammoniumnitrate (CAN) as the oxidant. The present method, involving the formation of C–S and C–C bonds, was also extended to (p-methoxyaryl)propiolates for thiocyanative ipso-cyclization
Copper(<scp>ii</scp>)-catalyzed oxidative <i>ipso</i>-annulation of <i>N</i>-arylpropiolamides and biaryl ynones with 1,3-diketones: construction of diketoalkyl spiro-trienones
作者:Chada Raji Reddy、Dattahari H. Kolgave、Uprety Ajaykumar、Remya Ramesh
DOI:10.1039/d2ob01282k
日期:——
A diverse range of diketoalkylated spiro-trienones involving a copper(ii)-catalyzed cascade radical addition/ipso-annulation/dearomatization reaction of N-arylpropiolamides and biaryl ynones are synthesized.
The challenging pyrrolo-12,1-j]quinolone core structure has been synthesized from N-(alkynoyl)-6-methoxytetrahydroquinoline in good yields using electrophilic cyclization as the key step. These reactions require simple starting materials and mild reaction conditions. In addition, we have demonstrated that the iodine moiety, which could be easily introduced in the final step, is very useful for further functionalization by employing various palladium-catalyzed cross-coupling reactions. (C) 2012 Elsevier Ltd. All rights reserved.