Carbonylation reactions represent useful tools for organic synthesis. However, the necessity to use gaseous carbon monoxide is a disadvantage for most organic chemists. To solve this problem, novel protocols have been developed for conducting palladium‐catalyzed reductive carbonylations of arylbromides and alkoxycarbonylations using paraformaldehyde as an external CO source (CO gas free). Hence, aromatic
Studies on the biosynthesis of the antibiotic reductiomycin in Streptomyces xanthochromogenus
作者:Hyeongjin Cho、John M. Beale、Cynthia Graff、Ursula Mocek、Akira Nakagawa、Satoshi Omura、Heinz G. Floss
DOI:10.1021/ja00079a009
日期:1993.12
The biosynthesis of the antibiotic reductiomycin (I) in Streptomyces xanthochromogenus was investigated by feeding experiments with radioactive and stable isotope-labeled precursors. NMR and mass spectroscopic analyses of the labeled I samples revealed that the acetoxy group comes from acetate, the 2-amino-3-hydroxycyclopent-2-enonemoiety arises by a novel intramolecular cyclization of 5-aminolevulinic