Enzymatic resolution of 2-dialkylaminomethylcyclopentanols and -cycloheptanols
摘要:
Extensive lipase screening was performed in relation to the asymmetric acetylation of rac-2-dialkylaminomethylcyclanols 1-5. The lipase PS- and Novozym 435-catalysed resolutions of compounds 1-5 were based on asymmetric acylation of the secondary OH group at the R-stereogenic centre with various vinyl eaters, in different organic media. High enantioselectivity (E>200) was observed when vinyl acetate was used as acylating agent, with diethyl ether or with diisopropyl ether as solvent. The reaction rates were markedly affected by the size of the alicyclic ring, and by the solvent. (C) 1999 Elsevier Science Ltd. All rights reserved.
The invention is in the field of growth of Mycobacteria. In particular, agents have been identified which enhance the growth of Mycobacterial species, which are naturally slow-growing. Such agents can therefore be used in the identification of Mycobacteria and in the diagnosis of Mycobacterial infections.
Discovery of Potent Inhibitors of Dihydroneopterin Aldolase Using CrystaLEAD High-Throughput X-ray Crystallographic Screening and Structure-Directed Lead Optimization
作者:William J. Sanders、Vicki L. Nienaber、Claude G. Lerner、J. Owen McCall、Sean M. Merrick、Susan J. Swanson、John E. Harlan、Vincent S. Stoll、Geoffrey F. Stamper、Stephen F. Betz、Kevin R. Condroski、Robert P. Meadows、Jean M. Severin、Karl A. Walter、Peter Magdalinos、Clarissa G. Jakob、Rolf Wagner、Bruce A. Beutel
DOI:10.1021/jm030497y
日期:2004.3.1
Potent inhibitors of 7,8-dihydroneopterin aldolase (DHNA; EC 4.1.2.25) have been discovered using CrystaLEAD X-ray crystallographic high-throughput screening followed by structure-directed optimization. Screening of a 10 000 compound random library provided several low affinity leads and their corresponding X-ray crystal structures bound to the enzyme. The presence of a common structural feature in each of the leads suggested a strategy for the construction of a directed library of approximately 1000 compounds that were screened for inhibitory activity in a traditional enzyme assay. Several lead compounds with IC50 values of about 1 muM against DHNA were identified, and crystal structures of their enzyme-bound complex's were obtained by cocrystallization. Structure-directed optimization of one of the leads thus identified afforded potent inhibitors with submicromolar IC50 values.