One-Pot Synthesis of 3-Hydroxyquinolin-2(1H)-ones from N-Phenylacetoacetamide via PhI(OCOCF3)2-Mediated α-Hydroxylation and H2SO4-Promoted Intramolecular Cyclization
摘要:
A clean, one-pot synthesis of the biologically important 3-hydroxyquinolin-2(1H)-one compounds has been realized from the readily available N-phenylacetoacetamide derivatives through a PhI(OCOCF3)(2)-mediated alpha-hydroxylation and a H2SO4-promoted intramolecular condensation. The hydroxyl group in the generated alpha-hydroxylated intermediate can be well tolerated in the second H2SO4-promoted cyclization step.
We report a phosphine‐catalyzed activation of electron‐deficient vinylcyclopropanes (VCPs) to generate an ambident C5 synthon that is poised to undergo consecutive reactions. The utility of the activation is demonstrated in a phosphine‐catalyzed rearrangement of vinylcyclopropylketones to cycloheptenones in good yields with a broad substrate scope. Mechanistic investigations support a stepwise process
Fusco,R. et al., Gazzetta Chimica Italiana, 1962, vol. 92, p. 1040 - 1061
作者:Fusco,R. et al.
DOI:——
日期:——
One-Pot Synthesis of 3-Hydroxyquinolin-2(1<i>H</i>)-ones from <i>N-</i>Phenylacetoacetamide via PhI(OCOCF<sub>3</sub>)<sub>2</sub>-Mediated α-Hydroxylation and H<sub>2</sub>SO<sub>4</sub>-Promoted Intramolecular Cyclization
A clean, one-pot synthesis of the biologically important 3-hydroxyquinolin-2(1H)-one compounds has been realized from the readily available N-phenylacetoacetamide derivatives through a PhI(OCOCF3)(2)-mediated alpha-hydroxylation and a H2SO4-promoted intramolecular condensation. The hydroxyl group in the generated alpha-hydroxylated intermediate can be well tolerated in the second H2SO4-promoted cyclization step.
Enamine-Based Domino Strategy for C-Acylation/Deacetylation of Acetoacetamides: A Practical Synthesis of β-Keto Amides
作者:Plamen Angelov
DOI:10.1055/s-0029-1219836
日期:2010.5
A practical three-step route for C-acylation/deacetylation of acetoacetamides is described. Initial enamination of the acetoacetamides with Boc-monoprotected ethylenediamine provides β-enamino amides, which are acylated at the α-carbon with excellent selectivity. The C-acylated derivatives undergo domino fragmentation in acidic media to give the corresponding α-Keto amides accompanied by 2-methyl-4