Dynamic thermodynamic resolution of N-methylpseudoephedrine α-bromo esters for asymmetric syntheses of α-hydroxy carboxylic acid derivatives
作者:Jiyoun Nam、Sang-kuk Lee、Yong Sun Park
DOI:10.1016/s0040-4020(03)00285-0
日期:2003.3
esters with an oxygen nucleophile is described. Temperature controlled epimerization–substitution sequence provides a practical protocol for the preparation of highly enantioenriched α-hydroxy carboxylic acidderivatives up to 72% yield with 99:1 er.
The Goldilocks Principle in Phase Labeling. Minimalist and Orthogonal Phase Tagging for Chromatography-Free Mitsunobu Reaction
作者:Mariann Szigeti、Zoltán Dobi、Tibor Soós
DOI:10.1021/acs.joc.8b00014
日期:2018.3.2
An inexpensive and chromatography-free Mitsunobu methodology has been developed using low molecular weight and orthogonally phase-tagged reagents, a tert-butyl-tagged highly apolar phosphine, and a water-soluble DIAD analogue. The byproduct of the Mitsunobureactions can be removed by sequential liquid–liquidextractions using traditional solvents such as hexanes, MeOH, water, and EtOAc. Owing to the
The present disclosure describes a formulation comprising a nanoparticle including a polymer-associated herbicide, such as fenoxaprop or pyroxsulam with an average diameter of between about 1 nm and about 500 nm; wherein the polymer is a polyelectrolyte and a dispersant or a wetting agent. The disclosure describes various formulations and formulating agents that can be included in the formulations.