HFIP-mediated strategy towards β-oxo amides and subsequent Friedel-Craft type cyclization to 2‑quinolinones using recyclable catalyst
作者:Arup K. Kabi、Raghuram Gujjarappa、Nagaraju Vodnala、Dhananjaya Kaldhi、Ujjawal Tyagi、Kalisadhan Mukherjee、Chandi C. Malakar
DOI:10.1016/j.tetlet.2020.152535
日期:2020.11
A simple and cost-effective 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP)-mediated protocol for the synthesis of β-oxo amides has been described by using amines and β-keto esters as substrates. The reaction conditions were found to be highly efficient towards the cleavage of CO bond and consequent formation of the products in excellent yields and selectivity. The obtained β-oxo amides were further transformed
Ni(0)–Cu(<scp>i</scp>): a powerful combo catalyst for simultaneous coupling and cleavage of the C–N bond with cyclization to valuable amide-based pyrroles and 4-pyridones
作者:Dipanwita Roy、Satinath Sarkar、Radha M. Laha、Nabyendu Pramanik、Dilip K. Maiti
DOI:10.1039/c5ra12115a
日期:——
We demonstrate unprecedented Ni(0)–Cu(i) combo catalysis for sequential bond activated domino N–C/C–C coupled annulation with N–C bond cleavage to afford valuable amide-based polysubstituted pyrroles and 4-pyridones selectively from β-ketoanilides.
An efficient green protocol for the preparation of acetoacetamides and application of the methodology to a one-pot synthesis of Biginelli dihydropyrimidines. Expansion of dihydropyrimidine topological chemical space
作者:Fernando H. S. Gama、Rodrigo O. M. A. de Souza、Simon J. Garden
DOI:10.1039/c5ra14355a
日期:——
A one pot synthesis of Biginelli dihydropyrimidines. The novel use of the amino acids allows topological diversification of the chemical space.
一锅法合成Biginelli双氢嘧啶化合物。氨基酸的新颖应用使化学空间具有拓扑多样性。
Facile eco-friendly synthesis of novel chromeno[4,3-b]pyridine-2,5-diones and evaluation of their antimicrobial and antioxidant properties
broad spectrum antibacterial properties against all the evaluated bacteria, compound 5g exhibited good antioxidant properties. Tricyclic chromeno[4,3-b]pyridine-2,5-diones are precipitated as pure products from the reaction of 4-chloro-3-formyl-coumarin and acetoacetamides in PEG-300 as recyclable solvent and evaluated for their antimicrobial and antioxidant properties.
Synthesis of N-aryl 2-quinolinones via intramolecular C(sp<sup>2</sup>)–H amidation of Knoevenagel products
作者:Laichun Luo、Kaiqi Tao、Xiaozhi Peng、Chunling Hu、Yuanfeng Lu、Hong Wang
DOI:10.1039/c6ra21286g
日期:——
A practical synthesis of N-aryl 2-quinolinones via K2S2O8-mediated intramolecularC(sp2)–Hamidation of Knoevenagel products was developed. The reaction proceeded smoothly in a biphasic solvent system composed of n-butyl acetate and H2O.
通过K 2 S 2 O 8介导的Knoevenagel产品的分子内C(sp 2)-H酰胺化反应,开发了N-芳基2-喹啉酮的实用合成方法。反应在由乙酸正丁酯和H 2 O组成的双相溶剂体系中顺利进行。