Author/Authors :
Saijo، نويسنده , , Ryosuke and Kurihara، نويسنده , , Ken-ichi and Akira، نويسنده , , Kazuki and Uno، نويسنده , , Hidemitsu and Kawase، نويسنده , , Masami، نويسنده ,
Abstract :
Treatment of mesoionic 1,3-oxazolium-5-olates with TosMIC in the presence of a base causes a novel ring transformation affording 2(1H)-pyrazinones in moderate yields. The origin of C-2 carbonyl oxygen in the product was elucidated to be molecular oxygen, based on 18O-labeling experiments.
