A facile synthesis of 2-[1-(dialkylamino)alkyl]-4H-3,1-benzoxazin-4-ones by the reaction of 1,1-dimethylethyl 2-isocyanobenzoates with N,N-dialkyliminium iodides
作者:Kazuhiro Kobayashi、Hiroo Hashimoto、Mao Matsumoto、Hiroki Inouchi
DOI:10.1016/j.tet.2014.07.043
日期:2014.9
A convenient synthetic approach to 2-[1-(dialkylamino)alkyl]-4H-3,1-benzoxazin-4-ones has been developed. Thus, 1,1-dimethylethyl 2-isocyanobenzoates, which can be readily prepared from 2-nitrobenzoic acids by a simple four-step sequence, react with N,N-dialkyliminium iodides without using any catalysts under mild conditions to give the desired products in generally fair-to-good yields.
一种方便的合成方法,以2- [1-(二烷基氨基)烷基] -4- ħ -3,1-苯并恶嗪-4-酮已经研制成功。因此,可由2-硝基苯甲酸通过简单的四步顺序容易地制得的2-异氰基苯甲酸1,1-二甲基乙基酯与N,N-二烷基亚碘化碘化物反应,在温和条件下不使用任何催化剂即可得到所需产物。一般而言,收益率一般为良好。