Gold-catalyzed homo- and cross-annulation of alkynyl carboxylic acids: a facile access to substituted 4-hydroxy 2<i>H</i>-pyrones and total synthesis of pseudopyronine A
demonstrated. The reaction tolerates various substituted alkynyl carboxylic acids and moderate to good yields of α-pyrone scaffolds have been observed. Later, a gram-scale reaction of the acid and the totalsynthesis of the natural product pseudopyronine A have been carried out successfully.
已经证明了 Au( I ) 催化的炔基羧酸的均环化和交叉环化反应,提供了 3,6-二取代的 4-羟基 2 H-吡喃酮。该反应耐受各种取代的炔基羧酸,并观察到中等至良好产率的α-吡喃酮支架。随后,该酸的克级反应和天然产物假吡咯啉A的全合成已成功进行。