ring‐opening was exploited in a reaction with 2'‐hydroxy‐α‐heteroarylacetophenones leading to the formation of chromones. New simple method was developed for the synthesis of 2‐(ω‐carboxyalkyl)‐3‐heteroarylchromones without protecting either the phenolic or the carboxylic groups. Treatment with hydrazine led to the formation of 3(5)‐(ω‐carboxyalkyl)‐5(3)‐(2,4‐dihydroxyphenyl)‐4‐heteroarylpyrazoles.
在与2'-羟基-α-杂芳基
苯乙酮反应导致
色酮形成的过程中,利用了环状
羧酸酐发生开环的倾向。开发了一种新的简单方法来合成2-(ω-羧烷基)-3-杂芳基
色酮,而又不保护
酚基或羧基。用
肼处理导致形成3(5)-(ω-羧烷基)-5(3)-(
2,4-二羟基
苯基)-4-杂芳基
吡唑。