Mp. Doyle et al., ENANTIOSELECTIVE INTRAMOLECULAR CYCLOPROPANATION OF N-ALLYLIC AND N-HOMOALLYLIC DIAZOACETAMIDES CATALYZED BY CHIRAL DIRHODIUM(II) CATALYSTS, Tetrahedron, 50(15), 1994, pp. 4519-4528
Diazodecomposition of N-(tert-butyl)-N-(3-buten-1-yl)diazoacetamides c
atalyzed by dirhodium(II) tetrakis[methyl 2-pyrrolidone-5(S)-carboxyla
te], Rh-2(5S-MEPY)(4), and tetrakis[methyl 2-oxazolidinone-4(S)-carbox
ylate], Rh-2(4S-MEOX)(4), forms products from intramolecular cycloprop
anation in good yields with enantiomeric excesses ranging from 60-90%.
Intramolecular cyclopropanation with N,N-diallyldiazoacetamide (72% e
e) is competitive with intramolecular [3+2] dipolar cycloaddition.