Studies of transformations of 4-X-2,3,5,6-tetrafluoro-2?-aminosubstituted diphenyl ethers in DMF
作者:E. F. Kolchina、T. N. Gerasimova
DOI:10.1007/bf00704198
日期:1993.6
The rate of cyclization of pentafluoro- (1) and 4-Cl-2,3,5,6-tetrafluoro-2'-NHY-diphenyl ethers (2a, Y=Ac; 2b, Y=H; 2c, Y=Me) to form phenoxazines on refluxing in DMF increases with an increase in the nucleophilicity of the amino group. The cyclization of the N-acetyl derivative 2a is followed by the Smiles rearrangement, whereas the transformation of ethers 2b and c, containing free amino and N-methylamino groups, respectively, includes mainly an attack on the amino group at the ortho-position of the fluorinated ring. In the case of ether 2c, introduction of K2CO3 into the reaction mixture results in cyclization with the Smiles rearrangement.