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Bioorg Med Chem Lett. 2013 Oct 15;23(20):5540-3. doi: 10.1016/j.bmcl.2013.08.058. Epub 2013 Aug 21.

Synthesis and biological evaluation of biotin conjugates of (±)-(4bS,8aR,10aS)-10a-ethynyl-4b,8,8-trimethyl-3,7-dioxo-3,4b,7,8,8a,9,10,10a-octahydro-phenanthrene-2,6-dicarbonitrile, an activator of the Keap1/Nrf2/ARE pathway, for the isolation of its protein targets.

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Institute of Chemical Biology and Drug Discovery, Stony Brook University, Stony Brook, NY 11794, United States.


The tricycle 1 ((±)-(4bS,8aR,10aS))-10a-ethynyl-4b,8,8-trimethyl-3,7-dioxo-3,4b,7,8,8a,9,10,10a-octahydrophenanthrene-2,6-dicarbonitrile), a potent activator of the Keap1/Nrf2/ARE pathway, has the potential to be a first in class drug for the treatment of diabetic nephropathy. To identify the protein targets for the development of 1, the (1:1)-diasteromeric mixture of biotinylated tricycles 3a and 3b were designed and synthesized. For the synthesis of 3a and 3b, a new important precursor, hydroxylated tricycle (±)-16 was synthesized from 4 by a C1 α-methyl group oxidation protocol, which involves cyclopalladation of the C1 α-methyl group from a C2-oxime. For the induction of the phase 2 cytoprotective enzyme NQO1 in Hepa1c1c7 murine hepatoma cells, the diasteromeric mixture 3a and 3b shows high potency (CD, 75 nM) although this potency is lower than that of 1 and 16. Thus, biotinylated tricycles 3a and 3b may be promising tools for the isolation of the protein targets of 1.


Bioitin; Cyclopalladation; Diabetic nephropathy; Keap1/Nrf2/ARE pathway; Protein targets

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