Substituent directed regioselective synthesis of 2-oxonicotonic acids and methyl nicotinates
作者:Ramendra Pratap、Farahanullah、Resmi Raghunandan、P.R. Maulik、Vishnu Ji Ram
DOI:10.1016/j.tetlet.2007.05.011
日期:2007.7
An innovative synthesis of aryl tethered 1,2-dihydro-2-oxopyridine-3-carboxylic acids has been developed through nucleophile induced ring transformation of methyl 6-aryl-4-methylsulfanyl-2H-pyran-2-one-3-carboxylates using either cyanamide or arylamidine in excellent yields. Further, the reaction of methyl 6-aryl-4-methylsulfanyl-2H-pyran-2-one-3-carboxylates with formamidine acetate under analogous
通过亲核试剂诱导的6-6-芳基-4-甲基硫烷基-2 H-吡喃-2-一-3-羧酸甲酯的亲核反应,开发了一种创新的芳基拴链的1,2-二氢-2-氧吡啶-3-羧酸的合成方法使用氰酰胺或芳基idine胺均可获得极佳的收率。此外,在类似的反应条件下,6-芳基-4-甲基硫烷基-2 H-吡喃-2-一-3-羧酸甲酯与乙酸form的反应没有遵循相同的反应过程,并选择性地产生了烟酸甲酯。屈服。通过在PPA中加热,已经实现了6-芳基-4-甲基硫烷基-1,2-二氢-2-氧吡啶-3-羧酸的脱羧。在4-甲基硫烷基取代基3也被氧化成相应的甲磺酰基与间氯过苯甲酸。