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 potassiumfluoride (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
BOJILOVA, A.;IVANOV, CHR., SYNTHESIS, BRD, 1986, N 5, 415-416
作者:BOJILOVA, A.、IVANOV, CHR.
DOI:——
日期:——
Synthesis of the Nitrile and Some Esters of 3,3-Dimethyl-2-oxochroman-4-acetic Acid
作者:A. Bojilova、Chr. Ivanov
DOI:10.1055/s-1986-31658
日期:——
It is shown that the previously found rearrangement can be applied on the nitrile 4 (X = CN) when the anhydride used possesses only one α-hydrogen atom. Refluxing of this nitrile with isobutyric anhydride in the presence of triethylamine leads to the expected rearrangement product 5 (X = CN). Making use of the same anhydride, the esters 4 (X = COOR) are converted into esters 5 (X = COOR).