申请人:Rensselaer Polytechnic Institute
公开号:US04451659A1
公开(公告)日:1984-05-29
A method is disclosed for preparing pyrylium and thiapyrylium salts having the formula represented below (where X is O,S or Se): ##STR1## and where R.sup.1 and R.sup.2 represents a branched or unbranched alkyl radical having up to about 15 carbon atoms, an aromatic group having as substituents alkyl radicals with 1 to about 15 carbon atoms, alkoxy radicals having 1 to about 4 carbon atoms, substituted amino radicals have 1 to 2 carbon radicals containing 1 to about 4 carbon atoms, a heterocyclic group having as substitute alkyl radicals with 1 to about 15 carbon atoms, alkoxy radicals having 1 to about 4 carbon atoms and amino radicals having 1 or 2 carbon radicals containing 1 to about 4 carbons, thiophene radicals and furan radical containing a variety of substituents; R.sup.3 represents a thioalkyl radical having 1 to about 4 carbon atoms thiobenzyl, thioaryl and thiocycloalkyl, as well as thiohetaryl radicals such as thiohydridyl and related 5-and 6-membered systems; and Z.sup.- is an anionic function. The salts are prepared by condensing the methyl ketone with carbon disulfide in the presence of sodium hydride, treating the product with methyl iodide to form the .alpha.-oxoketenedithioacetal; condensing the .alpha.-oxoketenedithioacetal with another methyl ketone in the presence of two equivalents of potassium tert-butoxide to form a 1,5-enedione; and cyclizing the enedione with tetrafluoroboric acid.
公开了一种制备具有以下表示式(其中X为O,S或Se)的吡啶和硫代吡啶盐的方法:##STR1##其中R.sup.1和R.sup.2表示具有多达约15个碳原子的支链或非支链烷基基团,具有烷基基团的芳香族基团,其碳原子数为1到约15,具有1到约4个碳原子的烷氧基团,含有1到2个碳基团的1到约4个碳原子的取代氨基基团,具有作为取代基的烷基基团的杂环基团,其碳原子数为1到约15,具有1到约4个碳原子的烷氧基团和具有1或2个碳基团的1到约4个碳原子的氨基基团,含有各种取代基的噻吩基团和呋喃基团;R.sup.3表示具有1到约4个碳原子的硫代烷基基团,硫代苄基,硫代芳基和硫代环烷基,以及硫代杂芳基基团,如硫代氢基和相关的5和6元系统;Z.sup.-是一个阴离子功能。盐通过在氢化钠存在下将甲基酮与二硫化碳缩合制备,用甲基碘处理产物以形成α-氧代酮二硫缩醛;在两当量的叔丁氧基钾存在下将α-氧代酮二硫缩醛与另一个甲基酮缩合形成1,5-烯二酮;并用四氟硼酸使烯二酮环化制备。