1′R)-diastereomer of the latter have been enantiospecifically synthesized from sugar and L-threonine derivatives. The attempts to convert them into a pyridomycin precursor with the 2-(Z)-s-butylidene side chain were unsuccessful.
(2R,5R,6S,9S,10S,11R)-10-Hydroxy-2-[(1'S)-1'-Hydroxy-1'-methylpropyl]-5,11-二甲基-9-(3-pyridylmethyl )6-(benzyloxycarbonylamino)-8-aza-1,4-dioxacyclododecane-3,7,12-trione 及其 1'-O-甲基衍
生物,以及后者的 (2S,1'R)-非对映异构体由糖和
L-苏氨酸衍
生物合成。将它们转化为具有 2-(Z)-s-亚丁基侧链的
吡啶霉素前体的尝试没有成功。