Cyclic Carboxylic Anhydrides as New Reagents for Formation of Chromone Ring
作者:Mykhaylo S. Frasinyuk、Svitlana P. Bondarenko、Nataliia V. Gorbulenko、Alexander V. Turov、Volodymyr P. Khilya
DOI:10.1002/jhet.1721
日期:2014.5
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.