Stille coupling for the synthesis of isoflavones by a reusable palladium catalyst in water
作者:Ya‐Ting Chang、Ling‐Jun Liu、Wen‐Sheng Peng、Lin‐Ting Lin、Yi‐Tsu Chan、Fu‐Yu Tsai
DOI:10.1002/jccs.202000478
日期:2021.3
Isoflavones were synthesized from the reaction of 3‐bromochromone derivatives and aryltributylstannanes via Stille coupling catalyzed by a water‐soluble and reusable PdCl2(NH3)2/2,2′‐cationic bipyridyl system in aqueous solution. For prototype 3‐bromochromone, the coupling reaction was performed at 80°C for 24 hr with 2.5 mol% catalyst in water in the presence of tetrabutylammonium fluoride. After
异黄酮是通过水溶性可重用的PdCl 2(NH 3)2 / 2,2'-阳离子联吡啶系统在水溶液中催化的Stille偶联反应,由3-溴色酮衍生物与芳基三丁基锡烷反应制得的。对于原型3-溴苯并二氢呋喃酮,偶合反应是在氟化四丁基铵存在下,在水中使用2.5 mol%催化剂,在80°C下进行24小时。反应后,该水溶液可重复使用几次,表明其活性仅略有下降。对于取代的3-溴色酮,添加NaHCO 3需要较高的反应温度(120°C)才能获得满意的结果。此外,该方案可通过一锅反应获得天然产物,如黄豆苷元。