Regioselectivity of nitrilimines 1,3-dipolar cycloaddition: Novel synthesis of spiro[4,4]nona-2,8-dien-6-one derivatives
作者:Omar A. Miqdad、Nada M. Abunada、Hamdi M. Hassaneen
DOI:10.1002/hc.20666
日期:——
Regioselective1,3-dipolarcycloaddition of nitrilimines (generated in situ from dehydrohalogenation of the corresponding hydrazonoyl halides by the action of triethylamine) with 4-arylidene-1-aryl-2-phenyl-1H-imidazol-5(4H)-one 3 afforded the corresponding spiro[4,4]nona-2,8-dien-6-one 4. The reaction was carried out in dry benzene under reflux temperature. Refluxing in acetic acid, 4a was converted