Dilithiation of 1-hydroxy-5-aryltetrazoles with 2 equiv. of butyllithium in the presence of N,N,N'N'-tetramethylethylenediamine enables the introduction of ortho-substituents into the aryl ring to form compounds (6a e). The hydroxy group of 1-hydroxy-5-phenyltetrazole may be masked by alkylation with 9-anthrylmethyl chloride. The masking group is removed with 1,4-diazabicyclo[2.2.2] octane or migrated to N 3 by treatment with trifluoroacetic acid to form the N-oxide (10).
Dilithiation of 1-hydroxy-5-aryltetrazoles with 2 equiv. of butyllithium in the presence of N,N,N'N'-tetramethylethylenediamine enables the introduction of ortho-substituents into the aryl ring to form compounds (6a e). The hydroxy group of 1-hydroxy-5-phenyltetrazole may be masked by alkylation with 9-anthrylmethyl chloride. The masking group is removed with 1,4-diazabicyclo[2.2.2] octane or migrated to N 3 by treatment with trifluoroacetic acid to form the N-oxide (10).
作者:Andris J. Liepa、Dionne A. Jones、Thomas D. McCarthy、Roland H. Nearn
DOI:10.1071/ch00073
日期:——
Dilithiation of 1-hydroxy-5-aryltetrazoles with 2 equiv. of butyllithium in the presence of N,N,N'N'-tetramethylethylenediamine enables the introduction of ortho-substituents into the aryl ring to form compounds (6a e). The hydroxy group of 1-hydroxy-5-phenyltetrazole may be masked by alkylation with 9-anthrylmethyl chloride. The masking group is removed with 1,4-diazabicyclo[2.2.2] octane or migrated to N 3 by treatment with trifluoroacetic acid to form the N-oxide (10).