Atom-transfer radical reactions catalyzed by a coordinatively unsaturated diruthenium amidinate, [(η5-C5Me5)Ru(μ2-i-PrN C(Me)Ni-Pr)Ru(η5-C5Me5)]+
作者:Yukihiro Motoyama、Shiori Hanada、Shota Niibayashi、Kazuya Shimamoto、Naoki Takaoka、Hideo Nagashima
DOI:10.1016/j.tet.2005.08.037
日期:2005.10
Atom-transfer radical cyclization (ATRC) and addition (ATRA) catalyzed by a coordinatively unsaturated diruthenium amidinate complex 4, [(η5-C5Me5)Ru(μ2-i-PrNC(Me)Ni-Pr)Ru(η5-C5Me5)]+, are investigated, and their features are compared with those of atom-transfer radical polymerization (ATRP). As an example of ATRC, a cationic diruthenium amidinate 4 is found to exhibit excellent catalytic reactivity
由配位不饱和二钌催化原子转移自由基环化(ATRC)和加成(ATRA)脒基络合物4,[(η 5 -C 5我5)的Ru(μ 2 -我-PrNC(ME)N我-Pr)的Ru (η 5 -C 5我5)] +,进行了研究,它们的特征与那些原子转移自由基聚合(ATRP)的比较。作为ATRC的一个例子,发现阳离子di胺酸二钌4对N的环化具有极好的催化反应活性。-烯丙基α-卤代乙酰胺,包括环境温度下的生物碱骨架。从卤化物络合物原位产生的催化物种,(η 5 -C 5我5)的Ru(μ 2 -我-PrNC(ME)N我-Pr)的Ru(η 5 -C 5我5)(X)[ X = Cl,Br]和弱配位阴离子如NaPF 6和NaBPh 4的钠盐也显示出高催化活性。这实际上提供了解决作为实用催化剂的不稳定的4的解决方案。原位生成的催化剂种类4在室温下,α-烯烃对α,α,γ-三氯化γ-内酰胺与烯烃的分子间ATRA也有活性,以中等