Process for preparing 2-acetyl-1-aza-1-cycloalkenes useful as flavor components for bread and rice
申请人:RIJKSUNIVERSITEIT GENT
Faculteit van de Landbouwwetenschappen
Laboratorium voor Organische Scheikunde
公开号:EP0436481A1
公开(公告)日:1991-07-10
Straightforvard and inexpensive syntheses of 2-acetyl-1-aza-1-cycloalkenes usefull as bread and rice flavor components, i.e. 2-acetyl-1,4,5,6-tetrahydropyridine and 2-acetyl-1-pyrroline, respectively, comprise the following steps :
oxidation of cyclic amines to cyclic imines;
subsequent cyanation of cyclic amines to 2-cyano-1-azacycloalkanes ;
oxidation of 2-cyano-1-azacycloalkanes to 2-cyano-1-aza-1-cycloalkenes;
synthesis of 2-acetyl-1-aza-1-cycloalkenes by a Grignard reaction.
These syntheses give rise to the title compounds, free of side products, in a way easily amenable to industrial production.
直接、廉价的合成2-乙酰基-1-氮杂环烷烯,用作面包和米饭香味成分,即2-乙酰基-1,4,5,6-四氢吡啶和2-乙酰基-1-吡咯烷,包括以下步骤:将环状胺氧化为环状亚胺;随后将环状胺氰化为2-氰基-1-氮杂环烷;将2-氰基-1-氮杂环烷氧化为2-氰基-1-氮杂环烷烯;通过格氏反应合成2-乙酰基-1-氮杂环烷烯。这些合成方法可以轻松地用于工业生产,产物不含副产物。