Mukaiyama-Michael Reactions with<i>trans</i>-2,5-Diarylpyrrolidine Catalysts: Enantioselectivity Arises from Attractive Noncovalent Interactions, Not from Steric Hindrance
作者:Eeva K. Kemppainen、Gokarneswar Sahoo、Antti Piisola、Andrea Hamza、Bianka Kótai、Imre Pápai、Petri M. Pihko
DOI:10.1002/chem.201304240
日期:2014.5.12
the predicted and observed stereoselectivities. The analysis of intermolecular forces reveals that the enantioselectivity is mostly due to stabilizing noncovalentinteractions between the reacting partners, not due to sterichindrance. The role of attractivenoncovalentinteractions in enantioselective catalysis may be underappreciated.
Structural optimization of cyclic sulfonamide based novel HIV-1 protease inhibitors to picomolar affinities guided by X-ray crystallographic analysis
作者:Ashit K. Ganguly、Sesha S. Alluri、Chih-Hung Wang、Alyssa Antropow、Alex White、Danielle Caroccia、Dipshikha Biswas、Eunhee Kang、Li-Kang Zhang、Steven S. Carroll、Christine Burlein、John Fay、Peter Orth、Corey Strickland
DOI:10.1016/j.tet.2014.03.038
日期:2014.5
disclose the design of novelinhibitors 47 and 48 based on the X-ray structure of compound 5 bound to the HIV-1protease, their synthesis and activity against HIV-1protease. By making changes at the C4 position and the carbamate linkage the above compounds 47 and 48 were found to be approximately one hundred fold more active compared to 5 and their Ki values are in the picomolar range. An unusual observation
Copper-Catalyzed Enantioselective Henry Reaction of Enals and Subsequent Iodocyclization: Stereoselective Construction of Chiral Azatricyclic Frameworks
作者:Yirong Zhou、Yuequan Zhu、Shaobai Yan、Yuefa Gong
DOI:10.1002/anie.201305148
日期:2013.9.23
In the frame: A cascade sequence combining an asymmetric Henryreaction and a stereoselective intramolecular iodocyclization provides direct access to an enantioenriched tricyclic hexahydrochromeno[4,3‐b]pyrrole framework (see scheme). The Henryreaction is catalyzed by copper in the presence of L1.
在框架中:级联序列结合了不对称的亨利反应和立体选择性的分子内碘环化作用,可直接进入对映体富集的三环六氢色素[4,3- b ]吡咯骨架(参见方案)。在L1存在下铜催化了亨利反应。