A simple and effective method for the reduction of acyl substituted heterocyclic 1,3-dicarbonyl compounds to alkyl derivatives by zinc - acetic acid - hydrochloric acid
作者:Thomas Kappe、Rudolf Aigner、Peter Roschger、Barbara Schnell、Wolfgang Stadibauer
DOI:10.1016/0040-4020(95)00733-o
日期:1995.11
3-Acyl-4-hydroxy-2(1H)-quinolones (1a–k) were reduced in good yields (66–97%) to 3-alkyl-4-hydroxy-2(1H)-quinolinones (2a–k) using zinc powder (particle size <45 μm) in acetic acid/hydrochloric acid. This method could be transformed to 3-acetyl-4-hydroxy-coumarin (1l), 3-acetyl-4-hydroxy-2-pyranone (3a) and 3-acetyl-4-hydroxy-2(1H)-pyridinone (3b), which yielded the 3-ethyl derivatives 2l, 4a and 4b, respectively
3-酰基-4-羟基-2(1H)-喹诺酮(1a–k)以良好的收率(66–97%)降低为3-烷基-4-羟基-2(1H)-喹啉酮(2a–k)使用醋酸/盐酸中的锌粉(粒度<45μm)。该方法可转化为3-乙酰基-4-羟基香豆素(1l),3-乙酰基-4-羟基-2-吡喃酮(3a)和3-乙酰基-4-羟基-2(1H)-吡啶酮(3b)),分别产生3-乙基衍生物2l,4a和4b。