Potassium Fluoride Promoted Reaction of 3-Acylsubsti-Tuted 2H-1-Benzopyran-2-Ones with Acid Anhydrides. An Improved Method for the Synthesis of 4-(2-Oxoalkyl)-2H-Chroman-2-Ones. Part III<sup>1</sup>
作者:Anka Bojilova、Nestor A. Rodics、Rozitsa Nikolova、Christo Ivanov
DOI:10.1080/00397919208019275
日期:1992.3
Abstract The reaction of 3-acylsubstituted 2H-1-benzo-pyran-2-ones 1, 5 and 11a-c with acid anhydrides in the presence of potassium fluoride (KF)/molecular sieves 4A gives the 4-(2-oxoalkyl)-2-oxochromans 2, 6 and 12a-c as the main products. Also the 3-carboxylic acid derivatives, such as esters and N,N-dialkylamides, of 2H-1-benzopyran-2-one (11d-g) react with isobutyric acid anhydride in the presence
摘要 在氟化钾 (KF)/分子筛 4A 存在下,3-酰基取代的 2H-1-苯并-吡喃-2-酮 1、5 和 11a-c 与酸酐反应得到 4-(2-氧代烷基) -2-oxochromans 2, 6 和 12a-c 作为主要产物。此外,2H-1-苯并吡喃-2-酮 (11d-g) 的 3-羧酸衍生物,例如酯和 N,N-二烷基酰胺,在 KF/分子筛 4A 存在下与异丁酸酐反应,得到相应的 2-oxochroman-4-乙酸衍生物。