Studies On Isoxazole Formation from Alkyl Carboxylic Esters
作者:Yun He、Nan-Horng Lin
DOI:10.1055/s-1994-25620
日期:——
Alkylisoxazoles 1a-12a were prepared in moderate to high yields (58-83%) by condensation of 1.5 equivalents of the appropriate ketone oximes with an alkyl ester, followed by a mineral acid induced cyclization-dehydration reaction.
A palladium‐catalyzed direct arylation of isoxazoles with aryl iodides has been achieved. The CH bond at the 5‐position is activated selectively to give coupling products in moderate to good yields. This direct arylation was applied to the synthesis of a spiro‐type chiral ligand, which proved to be most effective to the palladium‐catalyzed tandem cyclization of a dialkenyl alcohol.