Synthesis of enantiomerically pure hydroxylated pyrroline N-oxides from d-ribose
摘要:
A convenient way to obtain enantiomerically pure hydroxylated pyrroline N-oxides is reported. The key step is the formation of omega-oxo criciates from (D)-ribose and a subsequent 1,3-azaprotio cyclotransfer reaction of the resulting oximino alkenoate derivatives. The stereochemistry of the nitrones obtained is discussed in relation to that of the starting compounds. (c) 2006 Elsevier Ltd. All rights reserved.
Synthesis of enantiomerically pure hydroxylated pyrroline N-oxides from d-ribose
作者:Nikolaos G. Argyropoulos、Theodoros D. Panagiotidis、John K. Gallos
DOI:10.1016/j.tetasy.2006.02.006
日期:2006.3
A convenient way to obtain enantiomerically pure hydroxylated pyrroline N-oxides is reported. The key step is the formation of omega-oxo criciates from (D)-ribose and a subsequent 1,3-azaprotio cyclotransfer reaction of the resulting oximino alkenoate derivatives. The stereochemistry of the nitrones obtained is discussed in relation to that of the starting compounds. (c) 2006 Elsevier Ltd. All rights reserved.
Asymmetric nitrone cycloadditions and their application to the synthesis of enantiopure pyrrolidine and pyrrolizidine derivatives
作者:Nikolaos G. Argyropoulos、Theodoros Panagiotidis、Evdoxia Coutouli-Argyropoulou、Catherine Raptopoulou
DOI:10.1016/j.tet.2006.10.076
日期:2007.1
The cycloaddition reactions of a pair of chiral pyrroline-N-oxides derived from d-ribose with some typical mono and disubstituted alkenes are reported. In all these reactions with monosubstituted alkenes as well as with dimethyl maleate the preferred stereochemical outcome of the cycloaddition step comes from a 5-exo-anti transition state whereas stereoisomers from the 5-exo-syn transition state are