A facile synthesis of fluorine-containing heterocycles - use of 1,1,1-trifluoro-2-alkanones as a convenient synthetic intermediate
作者:Yasuhiro Kamitori
DOI:10.1002/jhet.5570380339
日期:2001.5
3-alkanediones 2 easily obtainable from various aldehyde dialkylhydrazones were reacted with several diamines to afford trifluoromethylquinoxalines 3 and trifluoromethylpyrazines 4 in good yields. With the use of aldehydes and aqueous ammonia instead of diamines, diketones 2 were successfully converted to the corresponding 4-trifluoromethylimidazoles 5 in satisfactory yields.
3-Dimethylhydrazono-1,1,1-trifluoro-2-propanone as a Useful Synthetic Equivalent of Trifluoropyruvaldehyde — Application to Synthesis of Fluorine-containing Heterocycles
作者:Yasuhiro Kamitori
DOI:10.3987/com-03-9725
日期:——
3-Dimethylhydrazono-1,1,1-trifluoro-2-propanone (4) which is easily obtainable from formaldehyde dimethylhydrazone and trifluoroacetic anhydride was found to be an usuful synthetic equivalent of trifluoropyruvaldehyde for the synthesis of fluorine-containing heterocycles. With the use of 4, 4-trifluoromethylimidazoles and 2-trifluoromethylquinoxaline were successfully synthesized.
Electrophilic substitution reaction at an azomethine carbon atom. Acylation of aliphatic aldehyde hydrazones