Synthesis of Pulvinic Derivatives via TBAF-Mediated Regioselective Opening of an Unsymmetrical Monoaromatic Pulvinic Dilactone
摘要:
The synthesis of the monoaromatic pulvinic dilactone I from a tetronic acid derivative is reported. The reaction of 1 with various amines was found to provide the two pulvinamides regioisomers 2a and 2b. Using tetrabutylammonium fluoride (TBAF) as an activator, pulvinamides 2a could be obtained with excellent regioselectivities and good yields. Additions of alcohols to I are also studied, leading to similar observations.
natural mushroom pigment Norbadione A and three other pulvinicacids were shown by our group to display very efficient antioxidant properties by comparison with a collection of potent molecules including catechols, flavonoids, stilbenes, or coumarins. Despite numerous publications on robust and straightforward synthetic access to pulvinicacids by us and others, no report has been made to unravel the