Annulation of functionalized hexadienones as an efficient regioselective approach to N-aryl-2-trifluoromethyl)-4-pyridinamines
作者:Maria T. Cocco、Cenzo Congiu、Valentina Onnis
DOI:10.1016/s0040-4039(99)00758-3
日期:1999.6
Readily accessible fluorinated N-arylenaminones 3 were reacted with N,N-dimethylformamide dimethylacetal to produce functionalized hexadienones 4. Ring closure of 4 with ammonium acetate afforded selectively N-aryl-2-(trifluoromethyl)-4-pyridinamines 5 in good to excellent yields.
易于获得的氟化N-芳基氨基酮3与N,N-二甲基甲酰胺二甲基乙缩醛反应生成官能化的己二酮4。用乙酸铵将4闭环,以良好至优异的收率选择性地提供N-芳基-2-(三氟甲基)-4-吡啶胺5。