Combinatorial synthesis of nicotine analogs using an Ugi 4-CR/cyclization-reduction strategy
作者:Luis A. Polindara-García、Alfredo Vazquez
DOI:10.1039/c4ob00767k
日期:——
A practical one-pot synthesis of nicotineanalogs from Ugi 4-CR/propargyl adducts is reported. This methodology allows the rapid construction of the pyrrolidine moiety present in nicotine through an intramolecular base-promoted 5-endo cycloisomerization process, followed by a reduction of the resulting mixture of 2- and 3-pyrrolines to afford nicotineanalogs in good overall yields.
Catalytic, Enantioselective α-Additions of Isocyanides: Lewis Base Catalyzed Passerini-Type Reactions
作者:Scott E. Denmark、Yu Fan
DOI:10.1021/jo050549m
日期:2005.11.1
(Passerini-type reactions). The catalytic system of silicontetrachloride and a chiral bisphosphoramide (R,R)-1b provided high yields and good to excellent enantioselectivities for the addition of tert-butyl isocyanide to a wide range of aldehydes (aromatic, heteroaromatic, olefinic, acetylenic, aliphatic). Aqueous workup afforded the α-hydroxy tert-butyl amides whereas a low-temperature methanol quench followed
One-Pot Synthesis of N-Substituted β-Amino Alcohols from Aldehydes and Isocyanides
作者:Răzvan C. Cioc、Daan J. H. van der Niet、Elwin Janssen、Eelco Ruijter、Romano V. A. Orru
DOI:10.1002/chem.201500210
日期:2015.5.18
A practical two‐stage one‐potsynthesis of N‐substituted β‐aminoalcohols using aldehydes and isocyanides as starting materials has been developed. This method features mild reaction conditions, broad scope, and general tolerance of functional groups. Based on a less common central carbon–carbon bond disconnection, this protocol complements traditional approaches that involve amines and various carbon
Ugi Four-Center Three-Component Reaction as a Direct Approach to Racetams
作者:Eelco Ruijter、Romano Orru、Răzvan Cioc、Lola Schaepkens van Riempst、Peter Schuckman
DOI:10.1055/s-0036-1588672
日期:——
the Ugi four-center three-componentreaction (U4C-3CR). For the first time, γ-aminobutyric acid is employed as bifunctional input in the Ugireaction. This protocol is simple, general, and allows one-pot access to a range of drugs and bioactive small molecules. We report the synthesis of racetams, a diverse class of small molecule drugs, by means of the Ugi four-center three-componentreaction (U4C-3CR)
Compounds for inhibiting &bgr;-amyloid peptide release and/or its synthesis
申请人:Elan Pharmaceuticals, Inc.
公开号:US06211235B1
公开(公告)日:2001-04-03
Disclosed are compounds which inhibit &bgr;-amyloid peptide release and/or its synthesis, and, accordingly, have utility in treating Alzheimer's disease. Also disclosed are pharmaceutical compositions comprising a compound which inhibits &bgr;-amyloid peptide release and/or its synthesis.