Synthesis of 3,5-Isoxazolidinediones and 1<i>H</i>-2,3-Benzoxazine-1,4(3<i>H</i>)-diones from Aliphatic Oximes and Dicarboxylic Acid Chlorides
作者:Robert A. Izydore、Joseph T. Jones、Benjamin Mogesa、Ira N. Swain、Ronda G. Davis-Ward、Dwayne L. Daniels、Felicia Frazier Kpakima、Sharnelle T. Spaulding-Phifer
DOI:10.1021/jo402708j
日期:2014.4.4
The synthesis of the title compounds was carried out by reacting dicarboxylic acid chlorides with oximes in the presence of excess triethylamine. Disubstituted malonyl chlorides gave 2-alkenyl-4,4-dialkyl-3,5-isoxazolidinediones (8a-f) and 2,2;-ethylidene-bis[4,4-dialkyl-3,5-isoxazolidinedione]s (9a-f). Compounds 9 were formed from 8 and its N-unsubstituted 3,5-isoxazolidinedione decomposition product. Phthaloyl chlorides reacted with acetone oxime to yield 3-(1-methylethenyl)-1H-2,3-benzoxazine-1,4(3H)-diones (16a-e). Products 16 spontaneously decomposed to give N-unsubstituted 1H-2,3-benzoxazine-1,4(3H)-diones (17a-e) at rates that were dependent on temperature and solvent. Kinetic studies showed that two of the compounds decomposed by zero-order kinetics under neutral conditions. Butanedioyl chloride did not produce a cyclic product.