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题名: Substituted salen-Ru(II) complexes as catalysts in the asymmetric cyclopropanation of styrene by ethyl diazoacetate: the influence of substituents and achiral additives on activity and enantioselectivity
作者: Yao, XQ;  Qiu, M;  Lu, WR;  Chen, HL;  Zheng, Z
刊名: TETRAHEDRON-ASYMMETRY
发表日期: 2001-02-19
卷: 12, 期:2, 页:197-204
收录类别: SCI ;  CCR
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Inorganic & Nuclear ;  Chemistry, Organic ;  Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: A series of alkyl-, halogen- and nitro-substituted salen ligands, 1, have been employed in the asymmetric cyclopropanation of styrene with ethyl diazoacetate by its ruthenium(II) complex with [RuCl2(p-cymene)](2) or RuCl2(PPh3)(3) as precursors. The introduction of appropriate electron withdrawing groups in the salen ligands benefited the enantioselectivity of the reaction. Some additives, including O-donor, N-donor and P-donor ligands, were added to the reaction to improve the enantioselectivity and activity, and e.e.s of up to 80% were achieved. In the salen/[RuCl2(p-cymene)](2) system, the (1R,2S)-isomer was obtained in 80.2% e.e. by using the salen ligand If derived from 3,5-dibrominated salicylaldehyde with Et3N as additive. E.e.s of up to 81.3% for (1S,2R)-isomers were achieved by using the complex 2 synthesized from the nitro-substituted ligand Im and RuCl2(PPh3)(3). A possible mechanism was also discussed. (C) 2001 Elsevier Science Ltd. All rights reserved.
关键词[WOS]: COPPER CARBENOID REACTION ;  BIS-OXAZOLINE LIGANDS ;  COBALT(II) COMPLEXES ;  RUTHENIUM PORPHYRIN ;  HIGHLY EFFICIENT ;  CHIRAL LIGANDS ;  OLEFINS ;  EPOXIDES ;  AZIRIDINATION ;  DERIVATIVES
语种: 英语
WOS记录号: WOS:000167689600006
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138941
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China

Recommended Citation:
Yao, XQ,Qiu, M,Lu, WR,et al. Substituted salen-Ru(II) complexes as catalysts in the asymmetric cyclopropanation of styrene by ethyl diazoacetate: the influence of substituents and achiral additives on activity and enantioselectivity[J]. TETRAHEDRON-ASYMMETRY,2001,12(2):197-204.
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