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Título : Alkoxyl radical fragmentation of 3-azido-2,3-dideoxy-2-halo-hexopyranoses: a new entry to chiral polyhydroxylated 2-azido-1-halo-1-alkenes
Autor : Alonso-Cruz, Carmen R., Kennedy, Alan R., Rodríguez Morales, María S., Suárez, Ernesto
Fecha de publicación : 2-Aug-2007
Editor: Elsevier
Citación : Tetrahedron Letters 48(40): 7207-7210 (2007)
Resumen: A new general two-step methodology for the synthesis of chiral fluoro, chloro, bromo and iodo vinyl azides from carbohydrate-derived halohydrins has been developed. The anomeric alkoxyl radical fragmentation of 3-azido-2,3-dideoxy-2-halo-pyranoses under oxidative conditions with (diacetoxyiodo)benzene and iodine gave 2-azido-1,2-dideoxy-1-halo-1-iodo-alditols, which by chemoselective dehydroiodination afforded (Z,E)-2-azido-1,2-dideoxy-1-halo-4-O-formyl-pent-1-enitols in good overall yields. Preliminary thermolysis and photochemical studies of these compounds for the synthesis of hitherto unknown disubstituted 2-halo-3-alkyl-2H-azirines have also been accomplished.
Descripción : 4 pages, 2 tables, 1 scheme.-- Printed version published Oct 1, 2007.
Supporting information (experimental procedures and analytical data for all new compounds) available at:
Versión del editor:
ISSN: 0040-4039
DOI: 10.1016/j.tetlet.2007.07.190
Appears in Collections:(IPNA) Artículos

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