39185-03-0Relevant articles and documents
Studies on asymmetric synthesis of huperzine A. 1. Palladium-catalyzed asymmetric bicycloannulation of 5,6,7,8-tetrahydro-2-methoxy-6-oxo-5-quinolinecarboxylic esters
He, Xu-Chang,Wang, Bin,Bai, Donglu
, p. 411 - 414 (1998)
A bridged bicyclic compound 8, the key intermediate for the synthesis of huperzine A (1), was prepared by asymmetric palladium-catalyzed bicycloannulation of β-keto ester 2. A variety of chiral ligands and reaction conditions were tested. 52% ee values were observed.
Synthetic studies of pseurotin A: Preparation of an advanced lactam aldehyde intermediate
Mitchell, Judith M.,Finney, Nathaniel S.
, p. 4274 - 4281 (2007/10/03)
An efficient synthesis of the lactam core of pseurotin A has been accomplished. Key features of this synthesis include a tandem oxidation-cyclization to form the lactam from an acetylenic amide precursor. Although coupling of a lactam aldehyde with an app
Preparation and antiviral properties of new acyclic, achiral nucleoside analogues: 1- or 9-[3-hydroxy-2-(hydroxymethyl)prop-1-enyl]nucleobases and 1- or 9-[2,3-dihydroxy-2-(hydroxymethyl)propyl]nucleobases.
Boesen, Thomas,Madsen, Christian,Pedersen, Daniel Sejer,Nielsen, Brian M,Petersen, Asger B,Petersen, Michael A,Munck, Michael,Henriksen, Ulla,Nielsen, Claus,Dahl, Otto
, p. 1245 - 1254 (2007/10/03)
Acyclic, achiral nucleoside derivatives 1b-e of adenine, cytosine, 5-methylcytosine, and guanine, containing a 3-hydroxy-2-(hydroxymethyl)prop-1-enyl group on N-1 or N-9, have been prepared analogously to the previously described thymine derivative 1a. In contrast to the adenine and guanine derivatives, the cytosine derivative 9 was unstable, and was obtained in a low yield due to side reactions. These include cleavage of the propenyl group from the base, and the formation of a bicyclic compound. The thymine derivative, although stable under neutral conditions, likewise underwent a reversible cyclization reaction (Michael addition) in the presence of acids or bases. The 5-methylcytosine derivative was stable under neutral and basic conditions. Four other nucleoside derivatives 26a-d containing a 2,3-dihydroxy-2-(hydroxymethyl)propyl group on N-1 or N-9, three of which are new, have likewise been prepared. All compounds were evaluated as antiviral agents against HIV-1 and HSV-1 but were devoid of antiviral activity.