Chiral Dirhodium(II) Catalysts with Ortho-Metalated Arylphosphine Ligands: Synthesis and Application to the Enantioselective Cyclopropanation of 
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- 作者：Mario Barberis ; Julia Pé ; rez-Prieto ; Konrad Herbst ; and Pascual Lahuerta
- 刊名：Organometallics
- 出版年：2002
- 出版时间：April 15, 2002
- 年：2002
- 卷：21
- 期：8
- 页码：1667 - 1673
- 全文大小：101K
- 年卷期：v.21,no.8(April 15, 2002)
- ISSN：1520-6041
文摘
Chiral dirhodium(II) compounds, Rh2(O2CR)2(pc)2 (pc = ortho-metalated arylphosphine),with a head-to-tail arrangement (1-21) are used in the cyclopropanation of 
-diazo ketones.The influence of catalyst ligands and substrate structure on enantioselectivity is studied.Temperature and solvent dependence assays are performed, the best ee values being obtainedin refluxing pentane. Results compare favorably with those reported in the literature usingRu, Cu, and other Rh(II) catalysts.
-diazo ketones.The influence of catalyst ligands and substrate structure on enantioselectivity is studied.Temperature and solvent dependence assays are performed, the best ee values being obtainedin refluxing pentane. Results compare favorably with those reported in the literature usingRu, Cu, and other Rh(II) catalysts.