Efficient Synthesis of γ-Alkylidenetetronic Esters by Sequential Lewis Acid Catalyzed [3 + 2] Cyclizations and Palladium-Catalyzed Cross-Coupling Reactions
作者:Peter Langer、Tobias Eckardt、Toni Schneider、Cornelia Göbel、Regine Herbst-Irmer
DOI:10.1021/jo005565s
日期:2001.4.1
A new approach for the synthesis of gamma-alkylidenetetronic acids and esters is reported which involves Me3SiOTf-catalyzed, regio- and stereoselective cyclization of 4-alkoxy-1,3-bis(trimethylsilyloxy)-1,3-butadienes with oxalyl chloride. The alpha-hydroxy group of the butenolides is efficiently functionalized by palladium-catalyzed cross-coupling reactions via the corresponding enol triflates.
报道了一种新的合成γ-亚烷基乙二酸电子酸和酯的方法,该方法涉及Me3SiOTf催化4-草氧基氯与4-烷氧基-1,3-双(三甲基甲硅烷氧基)-1,3-丁二烯的区域和立体选择性环化。丁烯化物的α-羟基可通过相应的烯醇三氟甲磺酸酯通过钯催化的交叉偶联反应有效地官能化。