Chiral Aminal Templates: Diastereoselective Addition to Hydrazones; An Asymmetric Synthesis of α-Amino Aldehydes
作者:Alex Alexakis、Nathalie Lensen、Jean-Philippe Tranchier、Pierre Mangeney、J. Feneau-Dupont、J. P. Declercq
DOI:10.1055/s-1995-4042
日期:1995.8
The monohydrazone of glyoxal may be derivatized into a chiral aminal with diamine 7. The resulting chiral reagent 13 reacts with complete diastereocontrol with organolithium reagents in THF. This sterically controlled reaction may be altered to chelation control by using Grignard reagents in toluene, affording the opposite diastereomer in excellent de. The N-N bond of the hydrazine functionality is then cleaved with Raney nickel, assisted by ultrasound. After protection of the resulting primary amino functionality, the aminal is hydrolyzed to afford the desired α-amino aldehydes without epimerization. The same reaction sequence, without cleavage of the N-N bond, affords an α-hydrazino aldehyde.
Macrocyclic Ghrelin Receptor Antagonists and Inverse Agonists and Methods of Using the Same
申请人:Hoveyda Hamid R.
公开号:US20110105389A1
公开(公告)日:2011-05-05
The present invention provides novel conformationally-defined macrocyclic compounds that have been demonstrated to be selective modulators of the ghrelin receptor (GRLN, growth hormone secretagogue receptor, GHS-R1a and subtypes, isoforms and/or variants thereof). Methods of synthesizing the novel compounds are also described herein. These compounds are useful as antagonists or inverse agonists of the ghrelin receptor and as medicaments for treatment and prevention of a range of medical conditions including, but not limited to, metabolic and/or endocrine disorders, obesity and obesity-associated disorders, appetite or eating disorders, addictive disorders, cardiovascular disorders, gastrointestinal disorders, genetic disorders, hyperproliferative disorders, central nervous system disorders and inflammatory disorders.
Diaminoalkanes of Formula I have now been found which are orally active and bind to aspartic proteases to inhibit their activity. They are useful in the treatment or amelioration of diseases associated with elevated levels of aspartic protease activity. The invention also relates to a method for the use of the compounds of Formula I in ameliorating or treating aspartic protease related disorders in a subject in need thereof comprising administering to said subject an effective amount of a compound of Formula I.
The total synthesis of pamamycin-607. Part 2: Synthesis of the C6–C18 domain
作者:Benjamin H. Fraser、Roger J. Mulder、Patrick Perlmutter
DOI:10.1016/j.tet.2006.01.005
日期:2006.3
Synthesis of the C6–C18 domain of pamamycin-607 was achieved in ten steps and 7% overall yield from commercially available d-norvaline. The key asymmetric transformations included a Paterson anti aldol addition, an anti selective reduction of the resultant β-hydroxy ketone and a cis selective Bartlett type ring closure.