Transition-Metal-Free β-C–H Bond Carbonylation of Enamides or Amides with a Trifluoromethyl Group as CO Surrogate for the Synthesis of 1,3-Oxazin-6-ones
作者:Ping Song、Peng Yu、Jin-Shun Lin、Yiqun Li、Ning-Yuan Yang、Xin-Yuan Liu
DOI:10.1021/acs.orglett.7b00178
日期:2017.3.17
A cascade β-C–H bond trifluoromethylation/C(sp3)–F bond activation/hydrolysis reaction of enamides with Togni’s reagent has been disclosed. This formal C–H bond carbonylation reaction utilizes the CF3 group as a CO surrogate to provide an efficient approach to 1,3-oxazin-6-ones in satisfactory yields. Furthermore, CF3-containing 1,3-oxazin-6-ones could also be accessed using this method by using alkenyl
已经公开了酰胺与Togni试剂的级联β-C-H键三氟甲基化/ C(sp 3)-F键活化/水解反应。正式的C–H键羰基化反应利用CF 3基团作为CO替代物,以令人满意的收率提供了一种有效的方法来合成1,3-恶嗪-6-酮。此外,还可以使用烯基N-乙基酰胺,通过涉及一种C sp2- H,一个C sp3- H,一个C sp2- H的官能化,使用这种方法来获得含CF 3的1,3-恶嗪-6-酮。和三个C sp3–F键。该方法的广泛的底物范围使得能够获得合成或药学上重要的化合物,这是通过已知方法难以获得的。