racemization. 5-Substituted 1H-tetrazoles were effectively synthesized from aldoximes and diphenyl phosphorazidate (DPPA) under reflux conditions in xylenes. Various aldoximes underwent the cycloaddition reaction to afford the corresponding 5-substituted 1H-tetrazoles in short reaction times and in good yields. Chiral aldoximes derived from amino acids also gave aminotetrazoles with almost no racemization.
The invention relates to a process for the preparation of (S)-pyrrolidine-1H-tetrazole derivatives of formula
wherein
R
1
, R
2
and R
3
, independently of one another, represent hydrogen, halogen or an organic radical, in racemic form or as an enantiomer, a tautomer, an analog thereof or a salt thereof.
The invention relates to a process for the preparation of (S)-pyrrolidine-1H-tetrazole derivatives of formula
wherein
R
1
, R
2
and R
3
, independently of one another, represent hydrogen, halogen or an organic radical, in racemic form or as an enantiomer, a tautomer, an analog thereof or a salt thereof.