A new synthetic route for the γ-lactone precursors of hydroxyethylene dipeptide isosteres
摘要:
Delta-Phthalimido-gamma-ketoesters were obtained by the Pd catalyzed coupling reaction between acid chlorides and organozinc reagents derived from beta-iodoesters, and were converted into the gamma-lactone precursors of Phe-psi[H.E.]-Ala and Phe-psi[H.E.]-Pro (15a,b-18a,b).
Cobalt versus Osmium: Control of Both <i>trans</i>
and <i>cis</i>
Selectivity in Construction of the EFG Rings of Pectenotoxin 4
作者:Ahria Roushanbakhti、Yifan Liu、Paul C. M. Winship、Michael J. Tucker、Wasim M. Akhtar、Daryl S. Walter、Gail Wrigley、Timothy J. Donohoe
DOI:10.1002/anie.201708278
日期:2017.11.20
Two types of oxidative cyclisation reaction, utilising either osmium or cobalt catalysis, provide complete control of the relative stereochemistry of THF rings embedded in the complex pectenotoxin-4 ring system. In this manner, rapid access to either trans (Co) or cis (Os) 2,5-disubstituted THF rings of the natural product molecule was facilitated.
[EN] PROCESS FOR THE PREPARATION OF MACROCYCLIC KETONE ANALOGS OF HALICHONDRIN B<br/>[FR] PROCÉDÉ DE PRÉPARATION D'ANALOGUES CÉTONIQUES MACROCYCLIQUES DE HALICHONDRINE B
申请人:CIPLA LTD
公开号:WO2019211877A1
公开(公告)日:2019-11-07
The present invention discloses a novel process for the preparation of macrocyclic ketone analogs of halichondrin B or pharmaceutically acceptable salts thereof and to novel intermediates which are produced during the course of carrying out the novel process.
1,2,3,4,-tetrahydroquinoline-8-sulphonic acid chlorides and acids, their
申请人:Synthelabo
公开号:US05552410A1
公开(公告)日:1996-09-03
Compounds of the formula: ##STR1## in which R represents a chlorine atom or a hydroxyl group and R.sub.4 represents a (C.sub.1 -C.sub.4)alkyl group in the R or S form are useful as synthetic intermediates.