Stoffwechselprodukte von Mikroorganismen. 107. Mitteilung [1]. Die Struktur des Chlorothricins, eines neuartigen Makrolid-Antibioticums
作者:R. Muntwyler、W. Keller-Schierlein
DOI:10.1002/hlca.19720550627
日期:1972.7.10
AbstractChemical and spectroscopic evidence for the structural formula 9 of chlorothricolide methyl ester, derived from the aglycone of the antibiotic chlorothricin, is given. By chemical degradation and spectroscopic investigations structure 41 is deduced for the intact antibiotic.
Ruthenium-Catalyzed Aromatization of Aromatic Enynes via the 1,2-Migration of Halo and Aryl Groups: A New Process Involving Electrocyclization and Skeletal Rearrangement
作者:Hung-Chin Shen、Sitaram Pal、Jian-Jou Lian、Rai-Shung Liu
DOI:10.1021/ja0379159
日期:2003.12.1
The halo and aryl substituents of the 1,2-disubstituted styryl group of aromatic enynes undergo a 1,2-shift in the aromatization reaction catalyzed by TpRuPPh3(CH3CN)2PF6 (10 mol %) in toluene (110 degrees C, 6-8 h). The aryl group shifts to the neighboring olefin carbon, and the iodo (or bromo) substituent migrates to the terminal alkyne carbon. The mechanisms of these two migrations have been elucidated