Lipase-catalyzed transesterification of meso-cyclopentane diols
摘要:
The lipase-catalyzed transesterification of the meso-cyclopentane diols 1a - 6a with vinyl acetate in tetrahydrofuran/triethylamine in the presence of lipases of different origin has been investigated. Depending on the structure of the substrate and the origin of the lipase chiral cyclopentane derivatives with high enantiomeric excess could be obtained in good to excellent chemical yields.
Synthesis of diols using the hypervalent iodine(III) reagent, phenyliodine(III) bis(trifluoroacetate)
摘要:
1.2- and 1.3-Bis(trifluoroacetoxy) alcohols are easily obtained from the one-pot reaction of alkenes with phenyliodine(III) bis(trifluoroacetate) (PIFA) in the absence of any additive or catalyst. The products were converted into the corresponding diols by ammonolysis. The use of bicyclic alkenes has shown that rearranged 1,3-diacetoxy alcohols are mostly formed as the major products. (c) 2006 Elsevier Ltd. All rights reserved.