Origin of the <i>E</i>/<i>Z</i> Selectivity in the Synthesis of Tetrasubstituted Olefins by Wittig Reaction of α-Fluorophosphonium Ylides: An Explanation for the Low Stereoselectivity Observed in Reactions of α-Alkoxy Aldehydes
作者:Dominique Depré、Wim A. A. Vermeulen、Yolande Lang、Jean Dubois、Jan Vandevivere、Jeremy Vandermeersch、Longchuan Huang、Raphaël Robiette
DOI:10.1021/acs.orglett.7b00344
日期:2017.3.17
96/4) by Wittig reactionbetween α-heterosubstituted ketones and α-fluorophosphonium ylides. A detailed study of factors that control stereoselectivity in these reactions shows that stereoselectivity is the result of stabilizing CH···F and N···C═O interactions in the addition TS leading to the E isomer. This analysis provides a rationale for the observed decrease in selectivity for reactions of stabilized
[EN] BETA-LACTAMASE INHIBITOR COMPOUNDS<br/>[FR] COMPOSÉS INHIBITEURS DE BÊTA-LACTAMASE
申请人:ENTASIS THERAPEUTICS LTD
公开号:WO2018053215A1
公开(公告)日:2018-03-22
The present invention is directed to compounds which are beta-lactamase inhibitors. The compounds and their pharmaceutically acceptable salts are useful in combination with beta- lactam antibiotics, for the treatment of bacterial infections, including infections caused by drug resistant organisms, including multi-drug resistant organisms. The present invention includes compounds according to Formula (I): or a pharmaceutically acceptable salt thereof, wherein the values of R1, R2, R3, R4, R5 and R6 are described herein.
Synthesis of β-Hydroxy-α-haloesters through Super Silyl Ester Directed <i>Syn</i>-Selective Aldol Reaction
作者:Susumu Oda、Hisashi Yamamoto
DOI:10.1021/ol402928p
日期:2013.12.6
Super silyl haloesters including chloro- and bromoacetate were synthesized and utilized for aldol reactions to give syn-β-hydroxy-α-haloacetates in good yields with high diastereoselectivities. β-Hydroxy-α-fluoroacetate was obtained by lithiation of super silyl bromofluoroacetate. Sequential Darzens reactions provided cis-glycidic esters in moderate yields.
Structure–activity relationships of GPX4 inhibitor warheads
作者:John K. Eaton、Laura Furst、Luke L. Cai、Vasanthi S. Viswanathan、Stuart L. Schreiber
DOI:10.1016/j.bmcl.2020.127538
日期:2020.12
masked nitrile oxides can inhibit GPX4 covalently, a systematic assessment of potential electrophilic warheads with the capacity to inhibit cellular GPX4 has been lacking. Here, we survey more than 25 electrophilic warheads across several distinct GPX4-targeting scaffolds. We find that electrophiles with attenuated reactivity compared to chloroacetamides are unable to inhibit GPX4 despite the expected