Synthesis of Tertiary α-Hydroxy Acids by Silylene Transfer to α-Keto Esters
作者:Brett E. Howard、K. A. Woerpel
DOI:10.1021/ol702148x
日期:2007.10.1
alpha-Keto esters can be converted into alpha-hydroxy acids in a single flask involving metal-catalyzed silylene transfer, 6 pi-electrocyclization, Ireland-Claisen rearrangement, and hydrolysis. This reaction sequence is stereoselective and tolerates alkyl- and aryl-substituted a-keto ester substrates as well as an alpha-imino ester.
MEMBRANE ACTIVE MOLECULES
申请人:Branequest, Inc.
公开号:EP3615084A1
公开(公告)日:2020-03-04
[EN] MEMBRANE ACTIVE MOLECULES<br/>[FR] MOLÉCULES ACTIVES DANS UNE MEMBRANE
申请人:BRANEQUEST INC
公开号:WO2018200412A1
公开(公告)日:2018-11-01
A method of inducing anesthesia, sedation, and a method for treating disorders including central nervous system disorder, peripheral nervous system disorder, depression ischemia, and treatment with an anticonvulsant by administering an effective amount of a compound to a subject in need thereof.
[EN] SYSTEMS AND METHOD FOR GENERATION OF HYPERPOLARIZED MATERIALS<br/>[FR] SYSTÈME ET PROCÉDÉ DE GÉNÉRATION DE MATÉRIAUX HYPER-POLARISÉS
申请人:NVISION IMAGING TECH GMBH
公开号:WO2021198776A2
公开(公告)日:2021-10-07
A method for preparing an NMR material, comprising generating parahydrogen in gas or liquid form at a first location; transporting the parahydrogen away from the first location; mixing a precursor compound including a metabolite component with a catalyst for hydrogenation; hydrogenating the precursor compound using the parahydrogen; transferring polarization in the precursor compound to a nuclear spin of the metabolite component; cleaving a side arm of the precursor compound in a chemical reaction, with the metabolite molecule being one of the products of the reaction; separating the metabolite molecule from the catalyst for hydrogenation and other products of the reaction; and generating metabolite molecules for use in an MRI scanner by extracting a sample of the metabolite molecule having at least 5% polarization.
α-Oximono-esters as precursors to heterocycles – generation of oxazinone N-oxides and cycloaddition to alkene dipolarophiles
undergoes facile thermal cyclisation affording nitrones 1c and 1d in good yield. Oximes E-5a,b with a terminal methyl substituent on the alkene moiety furnish nitrone only under the influence of an external electrophile [PhSeBr/AgBF4]. A terminal Ph substituent on 5c,d prohibits formation of the cyclic dipole irrespective of reaction conditions, and whilst 5d reacts to afford a bicyclic isoxazolofuranone