Preparation of Arylphosphonates by Palladium(0)-Catalyzed Cross-Coupling in the Presence of Acetate Additives: Synthetic and Mechanistic Studies
作者:Marcin Kalek、Martina Jezowska、Jacek Stawinski
DOI:10.1002/adsc.200900590
日期:2009.12
arylphosphonate diesters via a palladium-catalyzed cross-coupling of H-phosphonate diesters with aryl electrophiles, promoted by acetate ions, was developed. A significant shortening of the cross-coupling time in the presence of the added acetate ions was achieved for bidentate and monodentate supporting ligands, and for different aryl electrophiles (iodo, bromo and triflate derivatives). The reaction conditions
一种有效的协议,用于arylphosphonate二酯的合成通过钯催化的交叉偶联芳基亲电子,由乙酸根离子促进H-膦酸二酯的,被开发。对于二齿和单齿支持配体以及不同的芳基亲电子试剂(碘,溴和三氟甲磺酸酯衍生物),在添加乙酸根离子的情况下,交叉偶联时间大大缩短。根据催化剂的量,支持的配体和所用乙酸根离子的来源对反应条件进行了优化。使用这种新开发的方案可以合成各种芳基膦酸酯,包括具有潜在生物学意义的芳基膦酸酯。还讨论了所研究反应的一些机理方面。