49620-06-6Relevant academic research and scientific papers
Enantioselective Total Synthesis of Nitraria Alkaloids: (+)-Nitramine, (+)-Isonitramine, (-)-Isonitramine, and (-)-Sibirine via Asymmetric Phase-Transfer Catalytic α-Allylations of α-Carboxylactams
Yang, Jewon,Park, Yohan,Yang, Sehun,Lee, Geumwoo,Ha, Min Woo,Kim, Mi-Hyun,Hong, Suckchang,Park, Hyeung-Geun
, p. 4375 - 4390 (2021/02/05)
Many optically active 2-azaspirocyclic structures have frequently been found in biologically active natural products. In particular, Nitraria alkaloids, (+)-nitramine, (+)-isonitramine, (-)-isonitramine, and (-)-sibirine, have stereogenicity on their quat
Highly enantioselective total synthesis of (+)-isonitramine
Park, Yohan,Lee, Young Ju,Hong, Suckchang,Lee, Myungmo,Park, Hyeung-Geun
, p. 852 - 854 (2012/04/05)
A new efficient enantioselective synthetic method of (+)-isonitramine is reported. (+)-Isonitramine was obtained in 12 steps (98% ee and 43% overall yield) from δ-valerolactam via enantioselective phase-transfer catalytic alkylation, Dieckman condensation
Enantioselective total syntheses of (-)-isonitramine, (-)-sibirine, and (+)-nitramine by ring-closing metathesis
Pandey, Ganesh,Prasanna Kumara,Kumar Burugu, Shiva,Puranik, Vedavati G.
, p. 7372 - 7377 (2012/01/19)
Concise enantioselective total syntheses of naturally occurring 2-azaspiro[5,5]undecan-7-ol (Nitraria) alkaloids viz. (-)-isonitramine, (-)-sibirine, and (+)-nitramine are accomplished in 42, 38, and 25 % overall yield, respectively, in six steps starting
Platinum(II)-catalyzed cyclizations forming quaternary carbon centers, using enesulfonamides, enecarbamates, or enamides as nucleophiles
Harrison, Tyler J.,Patrick, Brian O.,Dake, Gregory R.
, p. 367 - 370 (2007/10/03)
(Chemical Equation Presented) Cyclic enesulfonamides, enecarbamates, or enamides tethered to an alkyne cyclize readily with use of platinum(II) chloride. This reaction generates quaternary-substituted carbon centers within simple spiro-fused or more compl
Synthesis of racemic nitramine, isonitramine and sibirine
Deyine, Abdallah,Poirier, Jean-Marie,Duhamel, Lucette,Duhamel, Pierre
, p. 2491 - 2493 (2007/10/03)
Condensation of enol ether 6 with methyl vinyl ketone led easily to ketoaldehyde 7 whose cyclisation afforded the azaspiranic enone 8, a key intermediate for the synthesis of the title alkaloids.
Hydride-promoted ring expansion of 2-azaspiropyrrolinium salts: An approach towards the synthesis of (-)-nitramine
Alonso, Erick Rosas,Tehrani, Kourosch Abbaspour,Boelens, Mark,De Kimpe, Norbert
, p. 1726 - 1730 (2007/10/03)
An enantioselective approach toward the synthesis of the spiroalkaloid (-)-nitramine was achieved by electrophile-induced cyclization of a suitably substituted and protected chiral α-allylcyclohexanecarboxaldimine. Its hydride-promoted ring expansion after spirocyclization gave rise to the competitive formation of isomeric spiropyrrolidines and a spiropiperidine, the latter being further transformed into (-)-nitramine. Georg Thieme Verlag Stuttgart.
An asymmetric synthesis of (+)-isonitramine by 'triple allylic strain-controlled' intramolecular S(N)2' alkylation
Kim,Choi,Hong,Park,Kim
, p. 1433 - 1434 (2007/10/03)
The spirocyclic alkaloid (+)-isonitramine (1) has been synthesized in a stereoselective manner utilizing a novel 'triple allylic strain-controlled' intramolecular lactam enolate S(N)2' alkylation.
PLE-catalyzed resolution of α-substituted β-ketoesters application to the synthesis of (+)-Nitramine and (-)-Isonitramine
Westermann,Grosse Scharmann,Kortmann
, p. 2119 - 2122 (2007/10/02)
Substituted β-ketoesters can be prepared in enantiomerically pure form by pig liver esterase catalyzed hydrolysis of their racemic precursors. With the asymmetric carbon atom possessing a quaternary centre, (+)-Nitramine and (-)-Isonitramine have been syn
Stereoselective Synthesis of (+/-)-Isonitramine and (+/-)-Sibirine
Fujii, Masayuki,Kawaguchi, Koichi,Nakamura, Kaoru,Ohno, Atsuyoshi
, p. 1493 - 1496 (2007/10/02)
Spirocyclic alkaloids, (+/-)-isonitramine and (+/-)-sibirine were synthesized in high overall yields via a chemoselective reduction by Hantzsch ester (HEH), a coenzyme NADH model compound.
