Various approaches to the synthesis of nucleoside H-phosphonamidates have been investigated. Direct couplings of nucleoside H-phosphonates with amines have been hampered by extensive reactions of the condensing agents with amines. Preactivation of nucleoside H-phosphonates with pivaloyl chloride or chlorophosphates, followed by the addition of amines, notably diminished these side reactions. The most efficient and versatile route to nucleoside N-alkyl H-phosphonates was found to be aminolysis of the in situ-produced aryl nucleoside H-phosphonates with appropriate amines.
Stereospecific Aerobic Oxidative Dehydrocoupling of P(O)–H Bonds with Amines Catalyzed by Copper
作者:Yongbo Zhou、Jia Yang、Tieqiao Chen、Shuang-Feng Yin、Daoqing Han、Li-Biao Han
DOI:10.1246/bcsj.20130310
日期:2014.3.15
Copper-catalyzed stereospecific oxidative dehydrocouplings of P(O)–H bonds with amines under air took place efficiently at room temperature to afford the corresponding amidophosphorus compounds in high yields. Mechanistic studies showed that this dehydrocoupling reaction proceeded stereospecifically with inversion of stereochemistry at phosphorus.