The evolution of a stereoselective synthesis of the C1–C16 fragment of bryostatins
作者:Matthew Ball、Anne Baron、Ben Bradshaw、Raphaël Dumeunier、Matthew O'Brien、Eric J. Thomas
DOI:10.1039/c6ob01804a
日期:——
propiolate. Ester reduction, selective alcohol protection and oxidativecleavage of the terminal double bond gave the required aldehyde. The ketophosphonate was prepared in 13 steps from (R)-pantolactone using a synthesis based on a chelation controlled aldol condensation and an anti-selective reduction of a 3-hydroxyketone. Following the ketophosphonate-aldehyde reaction, selective deprotection followed
Total Synthesis of Jimenezin via an Intramolecular Allylboration
作者:Nina G. Bandur、David Brückner、Reinhard W. Hoffmann、Ulrich Koert
DOI:10.1021/ol0614471
日期:2006.8.1
[structure: see text] An efficient total synthesis of the annonaceous acetogenin jimenezin was achieved. The key steps used were a highly stereoselective intramolecularallylboration to establish the tetrahydropyran ring and an intramolecular Williamson reaction to close the tetrahydrofuran ring.
Synthesis and Molecular Editing of Callyspongiolide, Part 1: The Alkyne Metathesis/
<i>trans</i>
‐Reduction Strategy
作者:Guillaume Mata、Bernhard Wölfl、Alois Fürstner
DOI:10.1002/chem.201804987
日期:2019.1.2
alkyne seem to prevent effective coordination of the substrate to the ruthenium catalyst, which must carry a bulky Cp* ligand to ensure high trans‐selectivity. This notion is supported by the preparation of a callyspongiolide analogue, in which the two methyl groups in question are excised; its formation by RCAM followed by trans‐hydrostannation/proto‐destannation was straightforward. In parallel work
The invention features methods for the preparation of naturally occurring trihydroxy polyunsaturated eicosanoids and their structural analogs. The invention further provides new derivatives of trihydroxy polyunsaturated eicosanoids that can be prepared according to these methods. The invention also provides trihydroxy polyunsaturated eicosanoids and their use in pharmaceutical compositions.
Total synthesis of the polyene macrolide antibiotic roxaticin. I. Synthesis of the polyol fragment of roxaticin using a four-carbon chain extension strategy
The C11–C26 polyol fragment of roxaticin containing eight chiral centers has been prepared in a reiterative manner using coupling reactions of chiral dithianes and epoxides followed by stereoselective reduction.