84446-07-1Relevant academic research and scientific papers
RING-TRANSFORMATION OF 1,2,4-OXADIAZINE DERIVATIVES INTO 4-HYDROXYPYRIMIDINE DERIVATIVES: CATALYTIC HYDROGENATION OF 3-ARYL-5-ETHOXYCARBONYLMETHYLENE-5,6-DIHYDRO-4H-1,2,4-OXADIAZINE DERIVATIVES
Tabei, Katsumi,Kawashima, Etsuko,Takada, Toyozo,Kato, Tetsuzo
, p. 2061 - 2066 (2007/10/02)
Catalytic hydrogenation of 3-aryl-5-ethoxycarbonylmethylene-5,6-dihydro-4H-1,2,4-oxadiazine derivatives (1) is described.The method leads to new synthesis of 2-aryl-4-hydroxypyrimidine derivatives (3) involving cyclization of ethyl 3-benzimidoylimino-4-hydroxybutanoate derivatives (2) by the elimination of ethanol.Nickel catalyzed hydrogenation of 1 gave ethyl 2-aryl-4-oxazoylacetate (4) as a by-product besides product 3.
