The intramolecular cyclopropanation of various trans‐allylic diazoacetates and alkenyl diazoketones has been achieved with excellent enantioselectivities of up to 98% ee and in quantitative yields by using a water‐soluble ruthenium(II)/hydroxymethyl(phenyl)oxazoline catalyst in a water/ether biphasic medium. The catalyst could be reused at least five times.

Water-Soluble Chiral Ruthenium(II) Phenyloxazoline Complex: Reusable and Highly Enantioselective Catalyst for Intramolecular Cyclopropanation Reactions. -The easy separation of the cyclopropyl product, the water-soluble catalyst, and the simple reuse of the catalyst at least five times without significant decrease in reactivity are advantages of this method. -(ABU-ELFOTOH, A.-M.; NGUYEN, D. P. T.; CHANTHAMATH, S.; PHOMKEONA, K.; SHIBATOMI, K.; IWASA*, S.; Adv. Synth. Catal. 354 (2012) 18, 3435-3439, http://dx.

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