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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
Yao, XQ; Qiu, M; Lu, WR; Chen, HL; Zheng, Z
刊名TETRAHEDRON-ASYMMETRY
2001-02-19
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
关键词[WOS]COPPER CARBENOID REACTION ; BIS-OXAZOLINE LIGANDS ; COBALT(II) COMPLEXES ; RUTHENIUM PORPHYRIN ; HIGHLY EFFICIENT ; CHIRAL LIGANDS ; OLEFINS ; EPOXIDES ; AZIRIDINATION ; DERIVATIVES
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.
语种英语
WOS记录号WOS:000167689600006
引用统计
被引频次:30[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/138941
专题中国科学院大连化学物理研究所
作者单位Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
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GB/T 7714
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.
APA Yao, XQ,Qiu, M,Lu, WR,Chen, HL,&Zheng, Z.(2001).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.TETRAHEDRON-ASYMMETRY,12(2),197-204.
MLA Yao, XQ,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".TETRAHEDRON-ASYMMETRY 12.2(2001):197-204.
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