813433-73-7Relevant academic research and scientific papers
Organocatalytic enantioselective synthesis of quinolizidine alkaloids (+)-myrtine, (-)-lupinine, and (+)-epiepiquinamide
Fustero, Santos,Moscardó, Javier,Sánchez-Roselló, María,Flores, Sonia,Guerola, Marta,Pozo, Carlos Del
, p. 7412 - 7417 (2011/10/09)
The organocatalytic synthesis of quinolizidine alkaloids (+)-myrtine, (-)-lupinine, and (+)-epiepiquinamide is described. It involved, as the key step, an enantioselective intramolecular aza-Michael reaction (IMAMR) catalyzed by J?rgensen catalyst I, affording the common precursor with high enantioselectivity. This compound was subsequently transformed into the three alkaloids in a highly diastereoselective manner.
Asymmetric synthesis of Sedum alkaloids via lithium amide conjugate addition
Davies, Stephen G.,Fletcher, Ai M.,Roberts, Paul M.,Smith, Andrew D.
experimental part, p. 10192 - 10213 (2010/02/28)
Conjugate addition of lithium (R)-N-allyl-N-(α-methylbenzyl)amide or lithium (R)-N-but-3-enyl-N-(α-methylbenzyl)amide to an alkyl hexa-2,4-dienoate or alkyl hepta-2,6-dienoate, followed by ring-closing metathesis of the olefin functionalities within the resultant β-amino ester, generates a range of diastereoisomerically pure azacycles in good yield. These homochiral templates are readily transformed to a range of piperidine alkaloids of the Sedum family, and the corresponding five-, seven- and eight-membered ring homologues.
Chemoenzymatic approach to enantiopure piperidine-based β-amino esters in organic solvents
Liljeblad, Arto,Kavenius, Hanna-Maija,Taehtinen, Petri,Kanerva, Liisa T.
, p. 181 - 191 (2007/10/03)
This research concentrates on the enantioselectivities of lipase-catalysed reactions with methyl esters of 2-piperidylacetic acid and 3-piperidinecarboxylic acid derivatives. N-Acetylated 2-piperidylacetic acid methyl ester displayed good enantioselectivi
Stereocontrolled reduction of chiral pyrrolidine and piperidine β-enamino esters: Formal enantioselective synthesis of (+)-calvine
Calvet-Vitale, Sandrine,Vanucci-Bacqué, Corinne,Fargeau-Bellassoued, Marie-Claude,Lhommet, Gérard
, p. 7774 - 7782 (2007/10/03)
The results of a study dealing with the chemio- and diastereoselective reduction of chiral pyrrolidine and piperidine β-enamino esters 1, 2 and 3, 4 into β-amino esters are reported. This approach was successfully applied to a formal synthesis of (+)-calvine.
Enzymatic resolution of cyclic N-Boc protected β-aminoacids
Pousset, Cyrille,Callens, Roland,Haddad, Mansour,Larcheveque, Marc
, p. 3407 - 3412 (2007/10/03)
Methyl and ethyl esters of N-Boc homoproline, homopipecolic acid and 3-carboxymethyl-morpholine were kinetically resolved by hydrolysis catalysed by Burkholderia cepacia lipase to give the corresponding acids and residual esters in enantiomeric excesses better than 99% (E > 100).
Total synthesis of (-)-stellettamide B and determination of its absolute stereochemistry.
Yamazaki,Dokoshi,Kibayashi
, p. 193 - 196 (2007/10/03)
[figure: see text] The first total synthesis of (-)-stellettamide B has been achieved by a sequence based on amide coupling of the chiral 1-(aminomethyl)-indolizidine fragment, prepared by TiCl4-mediated asymmetric allylation of the tricyclic N-acyl-N,O-a
Investigation of the 4-O-alkylamine substituent of non-peptide quinolone GnRH receptor antagonists
DeVita, Robert J.,Goulet, Mark T.,Wyvratt, Matthew J.,Fisher, Michael H.,Lo, Jane-L,Yang, Yi Tien,Cheng, Kang,Smith, Roy G.
, p. 2621 - 2624 (2007/10/03)
Synthesis and in vitro activity of the enantiomers of quinolone GnRH antagonist (±)-1 are reported. Chiral amino alcohols were prepared from the appropriate cyclic D- or L-amino acids by the Arndt-Eistert homologation followed by reduction of the resulting esters. Incorporation of these pharmacophores was achieved via a novel Mitsunobu alkylation of 4-hydroxyquinolones. The key amine pharmacophore for binding to the rat GnRH receptor was most active in the S-configuration. Ring size was not important for potency with 4, 5, 6, and 7-membered ring amines exhibiting similar potency.
