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2005
Enantioselective syntheses
O 0031
Rh(II)-Catalyzed Enantioselective Cyclopropanation of Olefins with Dimethyl
via in situ Generated Phenyliodonium Ylide. — The title reaction pro11- 039 Malonate
ceeds in the presence of PhIO and a ruthenium catalyst with (I) as the ligand. It allows
the preparation of substituted cyclopropanes with good yields and enantioselectivities
of up to 98%. The catalyst is also effective for the reaction of (IIa) and (V) with Meldrum's acid (VII). — (MUELLER*, P.; GHANEM, A.; Org. Lett. 6 (2004) 23,
4347-4350; Dep. Org. Chem., Univ. Geneva, CH-1211 Geneva 4, Switz.; Eng.) —
Steudel
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