On the Condensation of 2,2-Difluoro-4-methyl-benzo[d]-1,3,2-dioxaborines with Cyano Acetic Acid Derivatives. Formation and Transformation of 3-Cyano-4-methyl-benzo [b]pyran-2-ones and their 2-Imine Precursors

Article abstract of DOI:10.1007/BF00807640

By condensation of 2,2-difluoro-4-methyl-benzo[d]-1,3,2-2H-dioxaborines(12) with cyano acetic acid derivatives in presence of weak bases, 3-cyano-4-methyl-benzo[b]pyran-2-ones (13) or their 3-cyano-4-methyl-benzo[b]pyran-2-imine precursors (14) are available in satisfactory yields.