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. Ringclosure of 4 with ammonium acetate afforded selectively N-aryl-2-(trifluoromethyl)-4-pyridinamines 5 in good to excellent yields.
Synthesis of new fluorinated 1,5-benzoxazepine derivatives
作者:Maria Teresa Cocco、Cenzo Congiu、Valentina Onnis、Angela Maria Bernard、Pier Paolo Piras
DOI:10.1002/jhet.5570340442
日期:1997.7
A simple approach to the fluorinated1,5-benzoxazepine ring system is described. By reacting commercially accessible aminophenols 1 and the trifluoroacetylvinyl ether 2, high yields of enaminones 3 were obtained. Functionalization of methyl group of compounds 3 gave rise to dieneamines 4 that were cyclized in acidic environment to benzoxazepine derivatives 5.