Efficient carbon-Ferrier rearrangement on glycals mediated by ceric ammonium nitrate: Application to the synthesis of 2-deoxy-2-amino-<i>C</i>-glycoside
作者:Alafia A Ansari、Y Suman Reddy、Yashwant D Vankar
DOI:10.3762/bjoc.10.27
日期:——
A carbon-Ferrier rearrangement on glycals has been performed by using ceric ammonium nitrate to obtain products in moderate to good yields with high selectivity. The versatility of this method has been demonstrated by applying it to differently protected glycals and by employing several nucleophiles. The obtained C-allyl glycoside has been utilized for the synthesis of a orthogonally protected 2-a
Synthesis of Polyhydroxylated 2<i>H</i>-Azirines and 2-Halo-2<i>H</i>-azirines from 3-Azido-2,3-dideoxyhexopyranoses by Alkoxyl Radical Fragmentation
作者:Carmen R. Alonso-Cruz、Alan R. Kennedy、María S. Rodríguez、Ernesto Suárez
DOI:10.1021/jo800182y
日期:2008.6.1
The reaction of 3-azido-2,3-dideoxypyranose and 3-azido-2,3-dideoxy-2-halohexopyranose compounds with (diacetoxyiodo)benzene and iodine generated 2-azido-1,2-dideoxy-1-iodoalditols and 2-azido-1,2-dideoxy-1-halo-1-iodoalditols, respectively. These beta-iodo azides could be transformed by chemoselective dehydroiodination into 2-azido-1,2-dideoxy-4-O-formyl-pent-1-enitols and (Z,E)-2-azido-1,2-dideoxy-1-halo-4-O-formyl-pent-1-enitols in good yields. Thermolysis and photochemical studies of these vinyl azides and 1-halovinyl azides for the synthesis of polyhydroxylated 3-alkyl-2H-azirines and the hitherto unknown 2-halo-3-alkyl-2H-azirines have also been accomplished.