1451998-94-9Relevant academic research and scientific papers
Catalytic δ-hydroxyalkynone rearrangement in the stereoselective total synthesis of centrolobine, engelheptanoxides A and C and analogues
Ahmad, Mohammad N.,Chopra, Sidharth,Fernandes, Rodney A.,Kumar, Praveen
, (2021/08/13)
A catalytic stereoselective total synthesis of centrolobine and engelheptanoxides A and C has been completed via a metal-free catalytic δ-hydroxyalkynone rearrangement to 2,3-dihydro-4H-pyran-4-one and diastereoselective hydrogenation to the all syn-2,4,6-trisubstituted pyran strategy. The onliest required chirality was introduced by Jacobsen kinetic resolution, which further directed the diastereoselective hydrogenation. A first stereoselective synthesis of engelheptanoxide A is also accomplished. The analogues and derivatives of centrolobine and engelheptanoxides prepared were evaluated for antitubercular activity against M. tuberculosis H37Rv ATCC 27294.
Synthesis of (+)-centrolobine and its analogues by using acyl anion chemistry
Sudarshan, Kasireddy,Aidhen, Indrapal Singh
, p. 2298 - 2302 (2013/05/09)
A new route based on the use of acyl anion chemistry was developed for the synthesis of (+)-centrolobine and its analogues. Acid-catalyzed benzylic cation initiated cyclization was the key step in the stereoselective formation of the cis-2,6-disubstituted tetrahydropyran ring. The developed methodology was applied to the synthesis of (+)-centrolobine analogues containing electron-donating substituents in the aryl rings.
