A newdegradationproduct was found in an ampule preparation of des-Gly10-NH2-LH-RH-ethylamide (fertirelin) stored at room temperatures. The same product, produced at a higher temperature, was identified to be a diastereomeric mixture of cyclo(His-Trp) by proton nuclear magnetic resonance spectroscopy, mass spectrometry, and comparison with authentic samples. Preferred conformations regarding substituents
A Mutasynthesis Approach with a<i>Penicillium chrysogenum</i>Δ<i>roqA</i>Strain Yields New Roquefortine D Analogues
作者:Kahina Ouchaou、Florian Maire、Oleksandr Salo、Hazrat Ali、Thomas Hankemeier、Gijsbert A. van der Marel、Dmitri V. Filippov、Roel A. L. Bovenberg、Rob J. Vreeken、Arnold J. M. Driessen、Herman S. Overkleeft
DOI:10.1002/cbic.201402686
日期:2015.4.13
Mutasynthesis roques: DHTD and roquefortineDanalogues have been produced by mutasynthesis with a P. chrysogenum mutant in which the HTD biosynthesis genes are deleted. The selection of synthetic precursors for this study highlights specificity of the mutant strain in both dehydrogenation and electrophilic aromatic substitution steps.