Uncatalyzed Reaction of Silyl Ketene Acetals with Oxalyl Chloride: A Straightforward Preparation of Symmetrical Pulvinic Acids
作者:Benoît Heurtaux、Claude Lion、Thierry Le Gall、Charles Mioskowski
DOI:10.1021/jo048403v
日期:2005.2.1
natural pulvinicacids were synthesized. Silyl ketene acetals derived from methyl arylacetates (4 equiv) reacted with oxalyl chloride at −78 °C, without the need of adding a catalyst. After treatment of the crude diketones with DBU and acidification with hydrochloric acid, symmetrical pulvinicacids methyl esters were obtained. Saponification of the methyl esters afforded the corresponding pulvinic acids