期刊
MONATSHEFTE FUR CHEMIE
卷 136, 期 7, 页码 1205-1219出版社
SPRINGER WIEN
DOI: 10.1007/s00706-005-0299-6
关键词
catalysts; chiral resolution; cyclopropanes; gas chromatography; high performance liquid chromatography
The dirhodium(Il)-catalyzed intermolecular cyclopropanation of a set of olefins with either diazo free phenyliodonium ylides or diazo compounds afforded cyclopropanes derived from Meldrum's acid, dimethyl malonate, (silanoxyvinyl)diazoacetates, 3,3,3-trifluoro-2-diazopropionate, ethyl diazo(triethyl)- and (dimethylphenyl)silylacetate with moderate to high yield in either racemic or enantio-enriched forms. The intramolecular cyclopropanation of triethylsilyl-substituted allyl diazoacetates in the presence of the chiral rhodium(H) catalyst [Rh-2(s-nttl)(4)] in toluene afforded the corresponding cyclopropanes with up to 37% ee. An efficient chiral separation method based on enantio selective GC and HPLC was developed. The method provides information about the chemical yields of the cyclopropane products, enantioselectivity, substrate specifity, and catalytic activity of the chiral catalysts used in the inter- and intramolecular cyclopropanation reactions and avoids time-consuming work-up procedures.
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