PYRIDAZINONE DERIVATIVES AND USE THEREOF AS P2X7 RECEPTOR INHIBITORS
Novel pyridazinone compounds of formula (I), which inhibit the purinergic P2X7 receptor and are useful for prevention, therapy and improvement of inflammatory and immunological diseases.
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(2009/06/27)
Studies on Pyrimidine Derivatives. XXXIX. Site-Selectivity in the Reaction of 5-Substituted and 4,5-Disubstituted Pyrimidine N-Oxides with Trimethylsilyl Cynanide
The site-selectivity in the modified Reissert-Henze reaction of 5-substituted and 4,5-disubstituted pyrimidine 1-oxides with trimethylsilyl cyanide was examined.The reaction of 5-substituted 4-methoxypyrimidine 1-oxides with trimethylsilyl cyanide gave exclusively 2-pyrimidinecarbonitriles in good yields without exception.On the other hand, the other 5-substituted and 4,5-disubstituted pyrimidine 1-oxides gave mainly 6-pyrimidinecarbonitriles.Keywords--site-selectivity; pyrimidine N-oxide; trimethylsilyl cyanide; Reissert-Henze reasction; pyrimidinecarbonitrile