The N,N′-dioxide−Cu(OTf)2complexes were applied in the asymmetric amination reaction of N-acetyl enamides with dialkyl azodicarboxylate, giving the corresponding products in good yields with high enantioselectivities (up to 91% ee). Precursors of vicinal diamine were readily obtained with excellent diastereoselectivities (>95:5) by NaBH4 reduction.
[EN] ISOXAZOLOPYRIDINE DERIVATIVES FOR USE IN THE TREATMENT OF HIF-MEDIATED CONDITIONS<br/>[FR] DÉRIVÉS D'ISOXAZOLOPYRIDINE DESTINÉS À ÊTRE UTILISÉS DANS LE TRAITEMENT D'ÉTATS À MÉDIATION PAR HIF
申请人:FIBROGEN INC
公开号:WO2009073669A1
公开(公告)日:2009-06-11
The present invention relates to novel compounds of formula (I) capable of modulating the stability and/or activity of hypoxia inducible factor (HIF) by inhibiting the activity of at least one HIF hydroxylase enzyme.
catalyzed transformations of O-acyl oximes to various N-heterocycles are well established. Herein, we report a catalyst free, oxime carboxylate based, three-component condensation method to access mono- and disubstituted pyrimidines. A broad range of substituted pyrimidines were prepared in moderate to excellent yields. Control experiments reveal that in situ generated formamidine is the key intermediate.
We report realization of the first enantioselective Cope-type hydroamination of oximes for asymmetric nitrone synthesis. The ligand promoted asymmetriccyclopropene “hydronitronylation” process employs a Cu-based catalytic system and readily available starting materials, operates under mild conditions and displays broad scope and exceptionally high enantio- and diastereocontrol. Preliminary mechanistic
Palladium-catalyzed Csp<sup>2</sup>–H carbonylation of aromatic oximes: selective access to benzo[d][1,2]oxazin-1-ones and 3-methyleneisoindolin-1-ones
A selective palladium-catalyzed carbonylation of Csp2–H bonds with aromatic oximes for the synthesis of benzo[d][1,2]oxazin-1-ones and 3-methyleneisoindolin-1-ones has been developed.