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2005
Cyclopropanation reactions
O 0138
Rhodium(II)-Catalyzed Inter- and Intramolecular Enantioselective Cyclopropawith Alkyl-Diazo(triorganylsilyl)acetates. — Intermolecular cyclopropana13- 040 nations
tion of styrene with diazoester (I) proceeds in the presence of a chiral rhodium(II) carboxylate catalyst at room temperature. Subsequent protiodesilylation of the resulting
diastereoisomeric mixture with Bu4NF is accompanied by epimerization at C(1). The
present new method can also be applied to intramolecular cyclopropanations of allylic
diazoacetates. — (MUELLER*, P.; LACRAMPE, F.; Helv. Chim. Acta 87 (2004) 11,
2848-2859; Dep. Org. Chem., Univ. Geneva, CH-1211 Geneva 4, Switz.; Eng.) —
S. Adam
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