465-62-3Relevant articles and documents
Concise Syntheses of bis-Strychnos Alkaloids (?)-Sungucine, (?)-Isosungucine, and (?)-Strychnogucine B from (?)-Strychnine
Zhao, Senzhi,Teijaro, Christiana N.,Chen, Heng,Sirasani, Gopal,Vaddypally, Shivaiah,Zdilla, Michael J.,Dobereiner, Graham E.,Andrade, Rodrigo B.
, p. 11593 - 11596 (2016)
The first chemical syntheses of complex, bis-Strychnos alkaloids (?)-sungucine (1), (?)-isosungucine (2), and (?)-strychnogucine B (3) from (?)-strychnine (4) is reported. Key steps included (1) the Polonovski–Potier activation of strychnine N-oxide; (2) a biomimetic Mannich coupling to forge the signature C23?C5’ bond that joins two monoterpene indole monomers; and (3) a sequential HBr/NaBH3CN-mediated reduction to fashion the ethylidene moieties in 1–3. DFT calculations were employed to rationalize the regiochemical course of reactions involving strychnine congeners.
Synthesis of bis-strychnos alkaloids (–)-sungucine, (–)-isosungucine, and (–)-strychnogucine B from (–)-strychnine
Zhao, Senzhi,Teijaro, Christiana N.,Chen, Heng,Sirasani, Gopal,Vaddypally, Shivaiah,O’Sullivan, Owen,Zdilla, Michael J.,Dobereiner, Graham E.,Andrade, Rodrigo B.
, p. 436 - 453 (2019)
It was developed a concise synthetic route resulting in the first syntheses of bis-Strychnos alkaloids (–)-sungucine, (–)-isosungucine, and (–)-strychnogucine B from commercially available (–)-strychnine. Employing a highly convergent synthetic strategy, it was demonstrated that both Strychnos monomers could be efficiently prepared from commercially available (–)-strychnine. The venerable Mannich reaction was enlisted to join the two Strychnos monomers in a biomimetic fashion. Subsequent epimerization and olefin isomerization yielded (–)-strychnogucine B. Functional group manipulation transformed (–)-strychnogucine B into (–)-sungucine and (–)-isosungucine. Computational chemistry was employed to rationalize the regiochemical course of key steps en route to the bis-Strychnos targets.