Nucleophilic Reaction upon Electron-Deficient Pyridone Derivatives. XIII. Regioselective Synthesis of 2-Substituted 3-Nitropyridines by One-Pot Reaction of Either 4- or 6-Substituted 1-Methyl-3,5-dinitro-2-pyridones with Ketones and Ammonia
A one-pot synthesis of 2-substituted 3-nitropyridines was developed by a ring transformation of 6- or 4-substituted 1-methyl-3,5-dinitro-2-pyridones (2 or 3) with ammonia and enamines derived from ketones. Some intermediates having a 2,6-diazabicyclo[3.3.1]nonane skeleton were isolated from reactions of 3. The ring transformation proceeds via an addition-addition-elimination-elimination mechanism.
This invention provides compounds of formula I:
wherein R1, R2, R3, R4, R5, and R6 are as described in the specification. The compounds are inhibitors of PLK and are thus useful for treating proliferative, inflammatory, or cardiovascular disorders.
This invention provides compounds of formula I:
wherein R
1
, R
2
, R
3
, R
4
, R
5
, and R
6
are as described in the specification. The compounds are inhibitors of PLK and are thus useful for treating proliferative, inflammatory, or cardiovascular disorders.
Regioslective Synthesis of 2-Substituted 3-Nitropyridines by One-Pot Reaction of Either 4- or 6-Substituted 1-Methyl-3,5-dinitro-2-pyridones with Ketones and Ammonia
作者:Yasuo Tohda、Tooru Kawara、Miyuki Eiraku、Keita Tani、Masahiro Ariga、Yutaka Mori
DOI:10.3987/com-91-5832
日期:——
Regioselective synthesis of 2-substituted 3-nitropyridines was achieved by one-pot reaction of either 4- or 6-substituted 1-methyl-3,5-dinitro-2-pyridones with ketones in the presence of ammonia. The selectivity is interpreted in terms of steric factor of substituent on the pyridone.