Mutaaspergillic and dl-hydroxyaspergillic acids, metabolites of aspergilli, were prepared by base-catalyzed hydroxylation of the corresponding 2-chloro-3, 6-dialkylpyrazine 1-oxides derived from DL-leucyl-valyl and DL-isoleucyl-leucyl anhydrides.
变霉酸和dl-羟基变霉酸是霉菌的代谢产物,通过碱催化的羟基化反应从对应的2-
氯-3,6-二烷基
吡嗪1-氧化物制备而成,这些化合物源自
DL-亮氨酸-缬
氨酸和D
L-异亮氨酸-亮
氨酸酸酐。