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- W2000461272 abstract "Titanium-mediated cyclopropanation of α,β-unsaturated esters failed to provide 1-vinylcyclopropanol derivatives in useful yields, but (E)-2-substituted-1-vinylcyclopropanols were formed diastereoselectively from O-protected β-oxo- and β-halo esters, with the allylic double bond being created subsequently (Knoevenagel condensation or dehydrohalogenation). Titanium-mediated cyclopropanation of homoallyl alk-2-enoates, on the other hand, directly provided the corresponding Z diastereomers. Palladium(0)-catalysed azidation of their sulfonic esters (tosylate, mesylate), azide reduction, and subsequent double bond cleavage afforded (E)- or (Z)-2-alkyl-2,3-methanoamino acids, although improvements are required to perform the total asymmetric syntheses of molecules with three membered-rings by these methods. (© Wiley-VCH Verlag GmbH, 69451 Weinheim, Germany, 2002)" @default.
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- W2000461272 date "2002-07-01" @default.
- W2000461272 modified "2023-10-17" @default.
- W2000461272 title "Titanium-Mediated Diastereoselective Formation of (E)- or (Z)-2-Substituted 1-Vinylcyclopropanols: Scope and Limitation, Applications" @default.
- W2000461272 doi "https://doi.org/10.1002/1099-0690(200207)2002:13<2160::aid-ejoc2160>3.0.co;2-1" @default.
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