Iridium-PPh3 Catalysts for Conversion of Amides to Enamines

Iridium-PPh3 Catalysts for Conversion of Amides to Enamines
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用于将酰胺转化为烯胺的铱-PPh3 催化剂

DOI:
10.1021/acs.organomet.8b00835
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发表时间:
2019
期刊:
影响因子:
2.8
通讯作者:
Nagashima Hideo
Nagashima Hideo
中科院分区:
化学2区
文献类型:
--
作者:
Une Yuta;Tahara Atsushi;Miyamoto Yasumitsu;Sunada Yusuke;Nagashima Hideo

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对Vaska络合物IrCl(CO)(PPh 3)2(1a)催化N,N-二烷基酰胺与TMDS反应的失活机理的研究引发了高活性Ir-PPh 3催化剂的发现:光化学活化1a和热活化IrCl(PPh 3)3(8)。这两种催化剂在低催化剂负载量下对N,N-二烷基-、N-烷基-N-芳基-和N,N-二芳基酰胺选择性转化为相应的烯胺均表现出优异的活性。在实际的催化反应中被溶剂或反应物稳定的14电子物种“ClIr(PPh 3)2”可能参与催化,在催化循环中产生“HIr(PPh 3)2”和“SiIr(PPh 3)2”(Si= Me 2 HSiOMe 2Si −)物种。通过简单的将[IrCl(η4-COD)] 2与PPh 3或其它磷配体混合,建立了“ClIrL 2”物种的原位生成方法,实现了烯胺的简易大规模合成.
Studies on the deactivation mechanism of the reaction ofN,N-dialkylamides with TMDS catalyzed by Vaska’s complex, IrCl(CO)(PPh3)2(1a), triggered the discovery of highly active Ir-PPh3catalysts: photochemically activated1aand thermally activated IrCl(PPh3)3(8). Both catalysts showed excellent activity toward the selective conversion of a variety ofN,N-dialkyl-,N-alkyl-N-aryl-, andN,N-diarylamides to the corresponding enamines with low catalyst loadings. The 14-electron species “ClIr(PPh3)2”, which is stabilized by solvents or reactants in the actual catalytic reactions, could be involved in the catalysis, which produces “HIr(PPh3)2” and “SiIr(PPh3)2” (Si= Me2HSiOMe2Si−) species in the catalytic cycle. An in situ generation method for the “ClIrL2” species was established by simply mixing [IrCl(η4-COD)]2with PPh3or other phosphorus ligands, which realized the facile large-scale syntheses of enamines.
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