This invention provides a process for preparing monoacylpyrazines which involves coreacting an aldehyde (R-CHO) and a pyrazine compound corresponding to the formula:
where R1, R2 and R3 are substituents selected from hydrogen and alkyl groups, and R1 and R when taken together with connecting elements may form an alicyclic or aromatic structure, and R in the aldehyde compound is selected from aliphatic, alicyclic and aromatic groups under free radical conditions in a heterogeneous reaction medium consisting of an organic phase and an aqueous phase. The compounds prepared have the formula:
where R, R', R2 and R3 are as previously defined, which is then recovered.
本发明提供了一种制备单酰基吡嗪的工艺,该工艺包括在由有机相和水相组成的异相反应介质中,在自由基条件下,将醛(R-CHO)和式中所对应的吡嗪化合物进行共反应: 式中 R1、R2 和 R3 是选自氢和烷基的取代基,R1 和 R 与连接元素结合在一起时可形成脂环族或芳香族结构,醛化合物中的 R 选自脂肪族、脂环族和芳香族基团。 所制备的化合物具有式: 式中 R、R'、R2 和 R3 如前定义,然后将其回收。
Smoking compositions containing a flavorant additive
申请人:Philip Morris Products Inc.
公开号:EP0256839B1
公开(公告)日:1991-11-06
HOUMINER, Y.;SOUTHWICK, E. W.;WILLIAMS, D. L., J. ORG. CHEM., 54,(1989) N, C. 640-643
作者:HOUMINER, Y.、SOUTHWICK, E. W.、WILLIAMS, D. L.
DOI:——
日期:——
US5017235A
申请人:——
公开号:US5017235A
公开(公告)日:1991-05-21
Smoking compositions containing a 2,5-diacylpyrazine flavorant additive
申请人:Philip Morris Inc.
公开号:US05017235A1
公开(公告)日:1991-05-21
In one of its embodiments this invention provides smoking compositions which contain a novel unsymmetrical 2,5-diacylpyrazine flavorant additive as illustrated by 1-[5-(1-propanoyl)-2-pyrazinyl]-2-methyl-1-propanone: ##STR1## Under normal cigarette smoking conditions, the 2,5-diacylpyrazine additive volatilizes and enhances the flavor and aroma of the mainstream and sidestream smoke. In another embodiment this invention provides novel unsymmetrical 2,5-diacylpyrazine compounds corresponding to the formula: ##STR2## where R is hydrogen or an alkyl radical containing between about 1-4 carbon atoms; and R.sup.1 and R.sup.2 are alkyl radicals containing between about 1-10 carbon atoms, and R.sup.1 and R.sup.2 are different alkyl groups.