1,6- and 1,7-naphthyridines.<b>II</b>. Synthesis from acyclic precursors
作者:M. Mercedes Blanco、Isabel A. Perillo、Celia B. Schapira
DOI:10.1002/jhet.5570360425
日期:1999.7
A number of 8-hydroxy-6-methyl-1,6-naphthyridin-5(6H)-one-7-carboxylic acid alkyl esters 3 and the isomeric 5-hydroxy-7-methyl-1,7-naphthyridin-8(7H)-one-6-carboxylic acid alkyl esters 4 were synthesized from acyclic precursors obtained starting from quinolinic anhydride 5. Thus, methanolysis of 5 afforded the hemiester 6 which treated with oxalyl chloride and sarcosine ethyl ester gave 3-(N-ethox
一些8-羟基-6-甲基-1,6-萘啶-5(6 H)-one-7-羧酸烷基酯3和同分异构的5-羟基-7-甲基-1,7-萘啶-8 (7 ħ) -酮-6-羧酸烷基酯4从得自喹啉酸酐5.因此开始得到无环前体合成,5甲醇,得到其与草酰氯和肌氨酸乙酯得到3-(处理过的半酯6 ñ -乙氧基羰基甲基-N-甲基氨基甲酰基)吡啶-2-羧酸甲酯8。用醇钠将化合物8环化成萘啶3a-e。异构体萘啶4a-c是通过将开放式中间体2-(N-乙氧基羰基甲基-N-甲基氨甲酰基)吡啶-3-羧酸甲酯9是通过以下方法制得的,该方法包括用肌氨酸乙酯处理5并用重氮甲烷酯化。讨论了化合物3和4的光谱性质(1 H nmr,uv,ir),并证实了所提出的结构。