Benjamin Prek, Jure Bezenšek, Marta Počkaj
Jan 26, 2017
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Journal
Tetrahedron
Abstract
Abstract In this paper, we describe a four step synthesis of 1,3-dioxo-1,3-dihydroisobenzofuran-4-carboxamides starting from (hetero)arylcarboxamides. These are first transformed to the corresponding acetamidines followed by condensation to substituted [(oxazol-4(5H)-ylidene)ethyl]benzamides, which are further derivatized to substituted [(oxazol-4(5H)-ylidene)allyl]benzamides. The latter compounds undergo a supposed [4 + 2] cycloaddition with maleic anhydride, leading to the final products.