Boron tribromide as a reagent for anti-Markovnikov addition of HBr to cyclopropanes
Although radical formation from a trialkylborane is well documented, the analogous reaction mode is unknown for trihaloboranes. We have discovered the generation of bromine radicals from boron tribromide and simple proton sources, such as water ortert-butanol, under open-flask conditions. Cyclopropanes bearing a variety of substituents were hydro- and deuterio-brominated to furnish anti-Markovnikov products in a highly regioselective fashion. NMR mechanistic studies and DFT calculations point to a radical pathway instead of the conventional ionic mechanism expected for BBr3
Chen, Shuming,Gieuw, Matthew H.,Houk, K. N.,Ke, Zhihai,Yeung, Ying-Yeung
p. 9426 - 9433
(2020/10/02)
Identification of a novel class of succinyl-nitrile-based Cathepsin S inhibitors
The synthesis and in vitro activities of a series of succinyl-nitrile-based inhibitors of Cathepsin S are described. Several members of this class show nanomolar inhibition of the target enzyme as well as cellular potency. The inhibitors displaying the greatest potency contain N-alkyl substituted piperidine and pyrrolidine rings spiro-fused to the α-carbon of the P1 residue.
Bekkali, Younes,Thomson, David S.,Betageri, Raj,Emmanuel, Michel J.,Hao, Ming-Hong,Hickey, Eugene,Liu, Weimin,Patel, Usha,Ward, Yancey D.,Young, Erick R.R.,Nelson, Richard,Kukulka, Alison,Brown, Maryanne L.,Crane, Kathy,White, Della,Freeman, Dorothy M.,Labadia, Mark E.,Wildeson, Jessi,Spero, Denice M.
Compounds of formula (I) wherein R is hydrogen, alkyl alkenyl, alkynyl, aryl, heteroaryl or heterocyclyl; and R1 is bicyclyl or heterobicyclyl; are useful in the treatment and prophylaxis of conditions mediated by s-CD23 or TNF.
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Page/Page column 7
(2010/01/31)
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