Synthesis of the bis‐spiroacetal core of 13‐desmethyl spirolideC has been completed based on a sila‐Stetter‐acetalization process. The acylsilane and enone partners in the Stetter reaction were prepared in 7 and 11 steps, respectively, from (S) and (R)‐aspartic acid. The quaternary center at C19 in the enone moiety was controlled by relying on the Seebach’s chiral self‐reproduction method using an
Stereoselective Synthesis of a Monocyclic Peloruside A Analogue
作者:Christoph W. Wullschleger、Jürg Gertsch、Karl-Heinz Altmann
DOI:10.1021/ol100123p
日期:2010.3.5
The stereoselective synthesis of the monocyclic peloruside A analogue 4 has been achieved, following a new efficient approach for the introduction of the side chain, involving a late-stage addition of vinyl lithium species 7a to aldehyde 8. Further key steps are a highly diastereoselective allyltitanation reaction and a RCM-based macrocyclization.
Diastereomeric 5R,6S-6-(1R-hydroxyethyl)-2-(1S-oxo-3R-thiolanylthio)-2-penem-3-carboxylic acid and 5R,6S-6-(1R-hydroxyethyl)-2-(1R-oxo-3S-thiolanylthio )-2-penem-3-carboxylic acid, and pharmaceutically-acceptable salts and in vivo hydrolyzable esters thereof, useful as systemic antibacterial agents; and intermediates and processes which are useful in the said synthesis of said diastereoisomers.
Stereospecific Nickel-Catalyzed Reductive Cross-Coupling of Alkyl Tosylate and Allyl Alcohol Electrophiles
作者:Quentin D. Tercenio、Erik J. Alexanian
DOI:10.1021/acs.orglett.1c02616
日期:2021.9.17
The stereospecific cross-coupling of easily accessed electrophiles holds significant promise in the construction of C–C bonds. Herein, we report a nickel-catalyzed reductive coupling of allyl alcohols with chiral, nonracemic alkyl tosylates. This cross-coupling delivers valuable allylation products with high levels of stereospecificity across a range of substrates. The catalytic system consists of
[EN] PEPTIDE CONJUGATES, CONJUGATION PROCESS, AND USES THEREOF<br/>[FR] CONJUGUÉS PEPTIDIQUES, PROCÉDÉ DE CONJUGAISON, ET LEURS UTILISATIONS
申请人:AUCKLAND UNISERVICES LTD
公开号:WO2019043604A1
公开(公告)日:2019-03-07
The invention relates to peptide conjugates, methods for making peptide conjugates, conjugates produced by the methods, and pharmaceutical compositions comprising the conjugates. Methods of eliciting immune responses in a subject and methods of vaccinating a subject, uses of the conjugates for the same, and uses of the conjugates in the manufacture of medicaments for the same are also contemplated.