An Advantageous Synthesis of 5,6,7,8-Tetra-Hydrotetrazolo[1,5-a]Pyridines
作者:Stefan Vonhoff、Andrea Vasella
DOI:10.1080/00397919908085802
日期:1999.2
Abstract The one-step synthesis of various O -benzyl-protected glyconotetrazoles from the corresponding glyconolactams is reported. The method is superior to the previously employed cycloaddition of azidonitriles as it uses readily available starting materials and leads to higher yields.
Synthesis and Some Transformations of 2-Acetamido-5-amino-3,4,6-tri-O-benzyl-2,5-dideoxy-D-glucono-1,5-lactam
作者:Thierry Granier、Andrea Vasella
DOI:10.1002/hlca.19980810508
日期:——
yield of 72% from the hydroxy amide 16 by oxidation with the Dess-Martin periodinane, acid-catalysed isomerization of the oxidation products in toluene, whereupon 18/19 precipitated, and reductive dehydroxylation of 18/19 (Et3SiH/BF3 · OEt2; Scheme 1). The amide 16 was obtained by ammonolysis of the N-acetylglucosamine-derived lactone 15. Depending on the oxidation method, 16 yielded the keto amide 17,