申请人:International Flavors & Fragrances Inc.
公开号:US03931270A1
公开(公告)日:1976-01-06
Process for producing 3-thia substituted alkane 1,4 diones comprising the steps of: I. Providing a 2-ene-1,4 dione having the structure: ##SPC1## Ii. Intimately admixing said 2-ene-1,4 dione with a sulfur compound having the formula: R.sub.3 SH thereby providing a substituted or sunsubstituted 2-thia substituted alkane 1,4 dione having the structure: ##SPC2## Wherein R.sub.3 is selected from the group consisting of acyl and royl, wherein R.sub.2 is lower alkyl; and wherein R.sub.1, R.sub.4 and r.sub.6 are the same or different and are selected from the group consisting of hydrogen and lower alkyl; wherein when R.sub.1 is hydrogen, the reaction (ii) is carried out in the presence of an organic base; and wherein when R.sub.1 is lower alkyl, the reaction (ii) is carried out in the absence of catalyst. Examples of such organic bases are piperidine, pyridine, triethyl amine, quinoline or alpha-picoline.
生产3-硫代取代的烷基1,4-二酮的方法包括以下步骤:
I. 提供结构为:## SPC1 ##的2-烯-1,4-二酮;
II. 将所述2-烯-1,4-二酮与具有公式R3SH的硫化合物混合,从而提供取代或未取代的2-硫代取代烷基1,4-二酮,其结构为:## SPC2 ##其中R3选自酰基和酰氧基组成的群,其中R2为低碳基;当R1为氢时,在有机碱的存在下进行反应(ii);当R1为低碳基时,反应(ii)在无催化剂存在下进行。这些有机碱的例子是吡啶,三乙胺,喹啉或α-哌啶。