(Z)-N'-(1-(3-bromophenyl)-2,2-dimethylpent-4-en-1-ylidene)-2,2,2-trichloroacetohydrazide 、 2,2,6,6-tetramethylpiperidine-1-oxoammonium tetrafluoroborate 在
caesium carbonate 作用下,
以
乙腈 为溶剂,
以78%的产率得到(5-(3-bromophenyl)-4,4-dimethyl-2-(((2,2,6,6-tetramethylpiperidin-1-yl)oxy)methyl)-3,4-dihydro-2H-pyrrol-1-ium-1-yl)(2,2,2-trichloroacetyl)amide