An Expedient Route to the Tetrazole Analogues of α-Amino Acids
摘要:
[GRAPHIC]Convenient conditions are described for the transformation of alpha-aminonitriles to the tetrazole analogues of alpha-amino acids. Refluxing the starting material in water/2-propanol at 80 degreesC with sodium azide and catalytic zinc bromide affords the tetrazole product in yields generally exceeding 90%.
Tetrazole analogues of amino acids and peptides IV
作者:Z. Grzonka、B. Liberek
DOI:10.1016/s0040-4020(01)98042-1
日期:1971.1
Racemic tetrazole analogues of N-benzyloxycarbonyl derivatives of alanine, S-benzyl-cysteine, leucine, phenylalanine and valine were resolved by means of L-tyrosine hydrazide. The resolution of tetrazole analogue of N-benzyloxycarbonyl-DL-phenylalanine provided the L-enantiomer. From the other fractionation experiments tetrazole analogues of N-benzyloxycarbonyl-D-alanine, -S-benzyl-D-cysteine, -D-leucine
stereoselective synthesis of 4,5-disubstituted imidazolidines-2-ones from alpha-aminoacids has been developed: the key steps are a Blaise reaction of bromoacetate on alpha-aminonitriles and further reduction. Although reduction with sodium cyanoborohydride afforded a mixture of cis and trans isomers 6a-e with moderate to good stereoselectivity, reduction with sodium in liquid ammonia gave the trans isomers
An Expedient Route to the Tetrazole Analogues of α-Amino Acids
作者:Zachary P. Demko、K. Barry Sharpless
DOI:10.1021/ol020096x
日期:2002.7.1
[GRAPHIC]Convenient conditions are described for the transformation of alpha-aminonitriles to the tetrazole analogues of alpha-amino acids. Refluxing the starting material in water/2-propanol at 80 degreesC with sodium azide and catalytic zinc bromide affords the tetrazole product in yields generally exceeding 90%.