Diastereoselective alkylations of oxazolidinone vinylogous glycolates
摘要:
A highly Z-selective isomerization (double bond migration) was observed when oxazolidinone vinylogous glycolate was exposed to a strong base to give N-acyl oxazolidinone, bearing an electron rich olefin. The corresponding enolate was exposed to alkyl halides to provide alkylated compounds on the gamma-position with respect to OBn group, with high regioselectivity and moderate diastereoselectivity. However, the nature of the chiral oxazolidinone leads to a significant increase in the reaction diastereoselectivity. A stereospecific formation of cis-olefin was also observed in these alkylated compounds. (c) 2012 Elsevier Ltd. All rights reserved.
Naphthyridine compounds and their use as inhibitors of HPK1 are described. The compounds are useful in treating HPK1-dependent disorders and enhancing an immune response. Also described are methods of inhibiting HPK1, methods of treating HPK1-dependent disorders, methods for enhancing an immune response, and methods for preparing the naphthyridine compounds.
[EN] POLYMYXIN ANALOGS USEFUL AS ANTIBIOTIC POTENTIATORS<br/>[FR] ANALOGUES DE LA POLYMYXINE UTILES EN TANT QUE POTENTIALISATEURS D'ANTIBIOTIQUE
申请人:SPERO OPCO
公开号:WO2017189866A1
公开(公告)日:2017-11-02
The disclosure provides compounds of the formula (I) or a tautomer thereof, or a pharmaceutically acceptable salt of either of the foregoing. The variables A, R1, and R2 are defined in the disclosure. The disclosure further includes pharmaceutical compositions comprising a compound of formula I together with at least one pharmaceutically acceptable carrier. The disclosure also includes a method of sensitizing bacteria to an antibacterial agent, comprising administering to a patient infected with the bacteria, simultaneously or sequentially, a therapeutically effective amount of the antibacterial agent and a compound of formula (I).
The first intermolecular asymmetric Michael addition of nitrogen-nucleophiles to alpha,beta-unsaturated carboxylic acids was achieved through a new type of arylboronic acid equipped with chiral aminothiourea. The use of BnONH2 as a nucleophile gives a range of enantioenriched beta-(benzyloxy)amino acid derivatives in good yields and with high enantioselectivity (up to 90% yield, 97% enantiomeric excess
instability of the dienes under Lewisacidic conditions. Only highly reactive CO and CN double bonds are employed in a hetero-Diels-Alderreaction which proceeds under catalysis of chiralLewisacids. We have developed a newchiral ligand, BINAMIDE, which is easily prepared from 1,1'-binaphtyl-2,2'-diamine by acylation. The highly diastereo- and enantioselective Diels-Alder reaction of Danishefsky type dienes
Enantioselective syntheses of densely functionalized pyrrolidines deriving their chirality from (R)-1-(phenyl)ethylamine are reported. Allylic amines and β-substituted-α,β-unsaturated esters are used as the building blocks in this one-pot reaction. Single electron transfer (SET) oxidation served to merge the reactivities of anionic enolate and radical intermediates. Ferrocenium hexafluorophosphate
报告了从 (R)-1-(苯基) 乙胺衍生其手性的密集官能化吡咯烷的对映选择性合成。烯丙胺和 β-取代-α,β-不饱和酯用作该一锅反应的构建单元。单电子转移 (SET) 氧化有助于合并阴离子烯醇化物和自由基中间体的反应性。易于制备、储存和处理的二茂铁六氟磷酸被用作 SET 氧化剂,持久性自由基 TEMPO 用作氧化剂,引入受保护的羟基官能团,这被证明有利于进一步衍生。在目标四取代吡咯烷中实现了独有的 2,3-反式和高达 6:1 的 3,4-顺式/反式非对映选择性。