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