Synthesis of aminoalkylpyrazoles and-isoxazoles from cyclic β-(trifluoroacetyl) enamines
作者:V. G. Nenajdenko、S. V. Pronin、E. S. Balenkova
DOI:10.1007/s11172-007-0055-7
日期:2007.2
A method for the synthesis of cyclic β-(trifluoroacetyl) enamines was proposed. Reactions of the latter with hydrazine and hydroxylamine gave pyrazoles and isoxazoles, respectively, containing trifluoromethyl and ω-aminoalkyl fragments. Addition of hydrazine (hydroxylamine) to the above amino enones was regiospecific, the regiochemistry of the heterocyclization of trifluoromethyl ketones being different
New Strategies for the Synthesis of Fluorinated Vinylogous Amidines and β-Enamino Ketones
作者:Santos Fustero、Marta García de la Torre、Belén Pina、Antonio Simón Fuentes
DOI:10.1021/jo990392w
日期:1999.7.1
imidoyl chlorides 3 with ketimines 1a provides fluorinated 1,3-diimines, which were exclusively isolated as vinylogous amidine tautomers 2beta, with good yields. Fluorinated beta-enamino ketones 4 are obtained by regioselective hydrolysis of 2. Complementary methods for the synthesis of regioisomeric beta-enamino ketones 4 and 5 are also reported. These methods include the reaction of azaenolates of