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。
Tributyltin hydride-mediated radical cyclisation of carbonyls to form functionalised oxygen and nitrogen heterocycles
作者:Jon Bentley、Paul A. Nilsson、Andrew F. Parsons
DOI:10.1039/b202077g
日期:2002.6.7
The tributyltin hydride-mediated cyclisation of unsaturated ethers and aminesbearing an aldehyde or α,β-unsaturated ketone group is reported. Cyclisation proceeds via reversible addition of the tributyltin radical to the carbonyl double bond to form an intermediate O-stannyl ketyl. This nucleophilic radical can add intramolecularly to electron-rich double bonds to form substituted 5- or 6-membered
Efficient access to novel tetra- and pentacyclic dihydroquinolin-2-ones by catalyst-free domino Knöevenagel hetero-Diels–Alder reactions from N-(2-formylphenyl)-N-methylcinnamamides and cyclic 1,3-dicarbonyls in water
An efficientcatalyst-freesynthesis of novel annulated hybrid derivatives of two known scaffolds, dihydroquinolinone and pyranopyranone, pyranopyrimidinedione, pyranocoumarin or chromenone is described. N-(2-Formylphenyl)-N-methylcinnamamides underwent a one-pot domino Knöevenagel hetero-Diels–Alder reaction with dimedone, N,N-dimethylbarbituric acid, 1,3-indanedione, 4-hydroxycoumarins and 4-hyd