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The review article gives a comprehensive survey of the synthesis and chemistry of 2-amino-4-oxo-4H-1-benzopyran-3-carboxaldehydes, covering the literature to March, 2016. [ABSTRACT FROM AUTHOR]

In Pd-catalyzed arylboronic acid addition to aryl aldehydes, the expected carbinol or asymmetrical ether can be obtained as the major product by altering aqueous solvent composition. Exploiting this methodology with 2-formylbiphenyls as reaction partner, a fluorene scaffold can be readily constructed in two steps. [ABSTRACT FROM AUTHOR]

The addition of arylboronic acids to aldehydes in dioxane/water as the solvent provides carbinols (III) whereas in the absence of dioxane the initially formed carbinols are converted into ethers (IV). [ABSTRACT FROM AUTHOR]