5-Hydroxy[1,2]oxazinan-3-ones as potential carbapenem and D-ala-D-ala surrogates
作者:Saul Wolfe、Christiana Akuche、Stephen Ro、Marie-Claire Wilson、Chan-Kyung Kim、Zheng Shi
DOI:10.1139/v03-123
日期:2003.8.1
proposed new family of antibacterial agents targeted to the penicillin receptor. The glycine and alanine members of the family have been synthesized, as racemates, in seven steps from the four-carbon synthon diketene and the tert-butyl esters of N-hydroxyglycine and N-hydroxyalanine. Numerous alternatives to diketene have also been examined, but these lead mainly to five-membered cyclic hydroxamates
Syntheses and Reactions of<i>N</i>-(Phenylpyruvoyl) Amino Acids
作者:Yasuhiro Chigira、Mitsuo Masaki、Masaki Ohta
DOI:10.1246/bcsj.42.224
日期:1969.1
α-Ethoxy- and α-acetoxycinnamoyl chlorides were synthesized by treatments of α-ethoxy-and α-acetoxycinnamic acid with thionyl chloride and oxalyl chloride, respectively, and reactions of ammo acid esters with the cinnamoyl chlorides were investigated in order to seek for a synthetic method of N-(phenylpyruvoyl) amino acids. N-Hydroxy- or N-benzyloxy-Dl-alanine esters prepared from 2-bromopropionic esters and hydroxylamine or benzyloxyamine were treated with α-ethoxycinnamoyl chloride to give the corresponding N-(α-ethoxycinnamoyl) derivatives. Treatment of l-leucine ethyl ester with α-acetoxycinnamoyl chloride afforded N-(α-acetoxycinnamoyl)-l-leucine ethyl ester, the removal of the acetyl group from which was readily accomplished under mild, basic conditions, and N-(phenylpyruvoyl)-l-leucine ester was obtained. Treatment of the ester with ammonia yielded 3-benzylidene-6-isobutyl-2,5-piperazinedione.
Use as agricultural fungicides of N-acyl-N-hydroxyalkanoic acid compounds of the formula ##STR1## and salts thereof, wherein each of the symbols has an assigned meaning.