Synthesis of Morpholine‐Based Analogues of (−)‐Zampanolide and Their Biological Activity
作者:Christian Paul Bold、Melanie Gut、Jasmine Schürmann、Daniel Lucena‐Agell、Jürg Gertsch、José Fernando Díaz、Karl‐Heinz Altmann
DOI:10.1002/chem.202003996
日期:2021.4
We describe the convergent synthesis of three prototypical examples of a new class of analogues of the complex, cytotoxicmarine macrolide (−)‐zampanolide that incorporate an embedded N‐substituted morpholine moiety in place of the natural tetrahydropyran ring. The final construction of the macrolactone core was based on a high‐yielding intramolecular HWE olefination, while the hemiaminal‐linked side
作者:Rubén Sánchez-Obregón、Benjamin Ortiz、Fernando Walls、Francisco Yuste、José L Garcı́a Ruano
DOI:10.1016/s0957-4166(99)00079-8
日期:1999.3
Chiral α-acetylenic oxiranes were easily synthesized from readily available propargylic esters by a four-step sequence involving the stereoselective reduction of α′-alkynyl β-keto sulfoxides with DIBAH (de 66–78%) and DIBAH/ZnBr2 (de 78–88%), followed by further reduction of the resulting hydroxy sulfoxides into the corresponding sulfenyl derivatives and final epoxy ring closure via sulfonium salt
intercepts a late‐stage intermediate of a previous total synthesis; from there on, this challenging target can be reached in a small number of steps. Key to success was a sequence of a molybdenum‐catalyzed ring‐closing alkyne metathesis (RCAM) reaction to forge the macrocyclic frame, followed by a gold‐catalyzed and strictly regioselective transannular hydroalkoxylation of the resulting cycloalkyne that