A highly site-selective acyloxylation of stable enamines with PhI(OAc)2 under metal-free conditions to afford (E)-vinyl acetate derivatives in good to excellent yields is described. Depending on the judicious choice of the solvent system, either the α- or β-site-selective product could be obtained with high selectivity. For the α-site-selective product, the rearranged amide compound is obtained as
An expedient [5 + 1] annulation method via Rh(III)-catalyzed C–H bond functionalization of enaminones to synthesize polyaromatic rings is described. The reaction tolerates a broad range of functional groups and offers a new entry to construct polycyclic aromatic compounds with amino and formyl substituents. A possible reaction mechanism was proposed based on the results obtained from isotope labeling
A green H2O-promoted solvent-free hydroamination of electron-deficient terminal alkynes with amines has been developed. All secondary amines, including aliphatic and aromaticamines, gave the corresponding (E)-enamines in good to excellent yields, whereas primary aromaticamines afforded Z-configured products in moderate yields. Propiolates, propyn-1-ones, propynamides, and 1-(ethynylsulfonyl)-4-methylbenzene
Synthesis of the Naphthalenone, Dihydroquinoline, and Dihydrofuran Derivatives
作者:Füsun Şeyma Güngör、Olcay Anaç、Özkan Sezer
DOI:10.1002/hlca.201000386
日期:2011.6
The reactions of enaminones with dimethyl diazomalonate were investigated in the presence of copper(II) acetylacetonate. From the reaction of (E)‐3‐[methyl(phenyl)amino]‐1‐phenylprop‐2‐en‐1‐one (6c), dimethyl 2‐[methyl(phenyl)amino]‐4‐oxonaphthalene‐1,1‐(4H)‐dicarboxylate, was unexpectedly obtained as the major product. Quinoline derivatives were formed as the major products in the case of N‐methyl‐p‐anisidino
Observations on the copper(II) catalyzed reactions of enaminones and dimethyl diazomalonate
作者:Füsun Şeyma Güngör、Olcay Anaç、Özkan Sezer
DOI:10.1016/j.tetlet.2007.05.063
日期:2007.7
The Cu(acac)2 catalyzed reactions of dimethyldiazomalonate with enaminones yielded 1,5-cyclization and α-CH insertion products. In the case of anilino derivatives (R1 or R2 = Ph), products resulting from an unusual insertion to the benzoyl ring dominated the reaction.