Synthesis of 3-(Trifluoromethyl)benzo[c][1,6]naphthyridines from Substituted 4H-Pyran-4-ones via 4-Amino-5-Aryl-2-(trifluoromethyl)pyridines
作者:Vladimir I Tyvorskii、Denis N Bobrov、Oleg G Kulinkovich、Wim Aelterman、Norbert De Kimpe
DOI:10.1016/s0040-4020(00)00637-2
日期:2000.9
yridines under the action of P2O5/POCl3 smoothly afforded 3-(trifluoromethyl)benzo[c][1,6]naphthyridines in good yields. Intermediate aminopyridines were synthesized in a two-step sequence from the corresponding 4H-pyran-4-ones, which were prepared by reaction of 2-acetyl-2-aryloxiranes and 4-dimethylamino-3-(4-methoxyphenyl)-3-buten-2-one with ethyl trifluoroacetate under basic conditions.
在P 2 O 5 / POCl 3的作用下,酰化的4-氨基-5-芳基-2-(三氟甲基)吡啶的环化反应平稳地提供了3-(三氟甲基)苯并[ c ] [1,6]萘啶。由相应的4 H-吡喃-4-酮按两步顺序合成中间体氨基吡啶,它们是通过2-乙酰基-2-芳基环氧乙烷与4-二甲基氨基-3-(4-甲氧基苯基)-3-的反应制备的在碱性条件下将丁烯-2-酮与三氟乙酸乙酯混合。