4-carbethoxy-3-trifluoromethyl-cyclohex-2-enone (1) toward electrophiles has been studied and compared with that of the parent Hagemann’s ester. Presence of the CF3 group could allow the selective introduction of substituents at three different sites. With alkyl halides the C-2 alkylation is completely favored. High selectivity is directed to the C-4 site with ethyl chloroformate, and only O-silylation occurred
已经研究了4-碳乙氧基-3-三
氟甲基-环己-2-烯酮(1)的烯醇盐对亲电试剂的反应性,并将其与母体哈格曼酯的反应性进行了比较。CF 3基团的存在可以允许在三个不同的位置选择性地引入取代基。对于卤代烷,C-2烷基化是完全有利的。用
氯甲酸乙酯对C-4位点具有高选择性,并且用甲
硅烷基化的
氯化物仅发生O-甲
硅烷基化。