NaIO4-mediated sequential iodination/amidation reaction of N-alkyl quinolinium iodide salts has been first developed. This cascade process provides an efficient way to rapidly synthesize 3-iodo-N-alkyl quinolinones with high regioselectivity and good functional group tolerance. This protocol was also amenable to the isoquinolinium salts, thus providing a complementary method for preparing the 4-iodo-N-alkyl
Ruthenium tetroxide oxidation of 3,4-dihydroisoquinolin-1(2H)-ones: An efficient synthesis of isoquinoline-1,3,4(2H)-triones.
作者:Shigeyuki YOSHIFUJI、Yukimi ARAKAWA
DOI:10.1248/cpb.37.3380
日期:——
Ruthenium tetroxide (RuO4) oxidation of 3, 4-dihydroisoquinolin-1(2H)-ones produced the corresponding isoquinoline-1, 3, 4(2H)-triones in good yields. In the cases of N-alkyl derivatives having two oxidation sites adjacent to the nitrogen atom, regioselective endocyclic oxidation was observed.
view of these observations, an unusual [4+2] cycloaddition of the electron-rich enol 21 with singletoxygen is proposed to be responsible for the formation of products 7 and 16, while products 6, 14 and 15 arise from both the [4+2] cycloaddition and the usual Schenck ene reaction pathways. This special diene reactivity of the isoquinolinone system towards singletoxygen is further interpreted by frontier
Metal-Free Air Oxidation in a Convenient Cascade Approach for the Access to Isoquinoline-1,3,4(2H)-triones
作者:Antonia Di Mola、Consiglia Tedesco、Antonio Massa
DOI:10.3390/molecules24112177
日期:——
methyl-2-(2-bromoacetyl)benzoate in reactions with primaryamines. An unexpected in situ air oxidation that follows a cascade process allowed the access to a series of isoquinoline-1,3,4(2H)-triones, a class of heterocyclic compounds of great interest containing an oxygen-rich heterocyclic scaffold. A modification of the original protocol, utilizing a Staudinger reaction in the presence of trimethylphosphine