Synthesis of (2S)-O-phosphohomoserine and its C-2 deuteriated and C-3 chirally deuteriated isotopomers: probes for the pyridoxal phosphate-dependent threonine synthase reaction
Chemistry in water - Part VI Catalytic isomerization and stereochemistry of reduction of acetylenics mediated by water-soluble phosphines
作者:Chantal Larpent、Gérard Meignan
DOI:10.1016/s0040-4039(00)79342-7
日期:1993.7
Reaction of water-soluble phosphines with disubstituted electrodeficient alkynes in H2O (D2O) gives rise either to mixtures of cis and trans (dideuterated) olefins or specifically to trans (dideuterated) olefins, by simple control of the phosphine amount. A cis-trans olefin isomerization catalyzed by sulfonated phosphines occurs in water and allows the obtention of specifically trans disubstituted
3-cycloadditions of isoquinolinium N-phenylimide (2a) and N-(2-pyridyl)imide (2b) to twelve α,β-unsaturated carboxylic esters and nitriles proceeded at room temp. with high yields; the reactions furnished tetrahydropyrazolo[5,1-a]isoquinoline derivatives and could be visually followed by the loss of the red color. In this class of azomethine imines, the imide nitrogen of 2 is the nucleophilic center which
Rhodium catalyzed C–H olefination of N-benzoylsulfonamides with internal alkenes
作者:Chen Zhu、John R. Falck
DOI:10.1039/c2cc16963k
日期:——
An annulation via tandem rhodium catalyzed CâH olefination of N-benzoylsulfonamides with internal olefins followed by CâN bond formation is disclosed. A N-substituted quaternary center is formed during the reaction thus providing efficient access to a series of 3,3-disubstituted isoindolinones.
2-(1-Alkoxycarbonyl)alkylidenetetrahydrofurans were readily synthesized by the codimerization of 2,3- or 2,5-dihydrofurans with α,β-unsaturated esters using a zerovalent Ru catalyst, Ru(cod)(cot), with high regio- and stereoselectivity.
Provided is a compound of formula (I):
or a pharmaceutically acceptable salt thereof. Also provided is a method of activating the Nrf2 pathway, comprising contacting cells with a sufficient amount of a compound of formula (I) described herein. Also provided is a method of treating a neurodegenerative disease, comprising administering to a subject in need of treatment for the neurodegenerative disease an effective amount of a compound of formula (I) described herein.