supported by NNSFC(No.20372043),Shandong Science and Technology Promotion Project(No.2005GG3202098);Natural Science Foundation of Shandong Province(No.Y2006C31).
In order to develop new antibiotics effective against resistant bacteria,a series of novel 15-membered macrolide derivatives were designed and synthesized by the modification of hydroxyl groups at C-11,C-12 and C-4" ...
we are grateful to the National Natural Science Foundation of China(No.20372043)for flnancial support for this Work.
Novel ethyl 7-chloro-6-fluoro-l-methyl-4-oxo-1, 4-dihydro-[1, 3]thiazeto[3, 2-a]quino- line-3-carboxylate 2 was prepared from 3-chloro-4-fluoroaniline in eight steps. It can be used as a new intermediate for the synth...