申请人:ISP Investments Inc.
公开号:US06624307B1
公开(公告)日:2003-09-23
Commercially viable process for producing 2,6-dihydroxy-3,4-dimethlpridine. The process includes reacting 2-cyanoacetamide with sodium methoxide followed by condensation with ethyl 2-methylacetoacetate in methanol to give the sodium salt of 2,6-dihydroxy-4,5-dimethyl-3-pyridinecarbonitrile. The sodium salt of 2,6-dihydroxy-4,5-dimethyl-3-pyridinecarbonitrile is hydrolyzed with hydrobromic acid and decarboxylated to the hydrobromide salt of 2,6-dihydroxy-3,4-dimethylpyridine. The desired 2,6-dihydroxy-3,4-dimethylpyridine is produced from the hydrobromide salt by neutralizing the same with sodium hydroxide.
生产2,6-二羟基-3,4-二甲基吡啶的商业可行工艺。该工艺包括将2-氰基乙酰胺与甲氧基钠反应,然后与甲醇中的乙酰乙酸乙酯缩合,以得到2,6-二羟基-4,5-二甲基-3-吡啶腈的钠盐。将2,6-二羟基-4,5-二甲基-3-吡啶腈的钠盐用氢溴酸水解并脱羧,以得到2,6-二羟基-3,4-二甲基吡啶的氢溴酸盐。通过用氢氧化钠中和该氢溴酸盐,可以得到所需的2,6-二羟基-3,4-二甲基吡啶。