Synthesis of the Integrastatin Nucleus Using the Ramberg−Bäcklund Reaction
摘要:
The first synthesis of the tetracyclic nucleus of the Integrastatins, natural products that have been shown to selectively inhibit HIV-1 integrase, is reported. Key steps of this synthesis involve a novel cis-selective Ramberg-Backlund reaction and an unusual Lewis acid-promoted cyclization step.
Methods of making 2,6-diaryl piperidine derivatives
申请人:Chen Gang
公开号:US20050154201A1
公开(公告)日:2005-07-14
Methods for preparing 2,6-diaryl piperidine derivatives are described. More particularly, 2,6-diaryl piperidines having formula 1-4 are prepared by cyclocondensation of an aryl or heteroaryl aldehyde with 1,3-acetonedicarboxylic acid.
Synthesis of 6-methyl-8H-dibenzo[a,g]quinolizin-8-imines via Reissert compounds
作者:Eberhard Reimann、Rainer Hertel、Jürgen Krauss
DOI:10.1007/s00706-007-0826-8
日期:2008.6
Alkylation of Reissertcompounds derived from 3-methylisoquinolines with several 2-cyanobenzylbromides followed by hydrolytic cleavage provided the corresponding 1-benzyl-3-methylisoquinolines. Treatment of the latter with methylmagnesiumiodide caused cyclization to the title compounds rather than formation of 2-acetylbenzylisoquinolines.
Unexpected Z-stereoselectivity in the Ramberg–Bäcklund reaction of diarylsulfones leading to cis-stilbenes: the effect of aryl substituents and application in the synthesis of the integrastatin nucleus
作者:Jonathan S. Foot、Gerard M. P. Giblin、A. C. Whitwood、R. J. K. Taylor
DOI:10.1039/b418426b
日期:——
With certain substituent patterns, benzylbenzylsulfone systems have been found to give unexpectedly high Z-stereoselectivity (up to E:Z = 1:16) in the Meyers variant of the Ramberg-Backlundreaction. A range of sulfones, bearing various aryl substituents, were explored to rationalize this unprecedented selectivity for Z-stilbene systems. This high level of double bond stereocontrol has also been
Lewis acid mediated endo-cyclisation of trimethylsilylmethylenecyclopropyl imines—a stereoselective route to indolizidines
作者:Suvi Rajamaki、Jeremy D. Kilburn
DOI:10.1039/b418476a
日期:——
Lewis acid mediated endo-cyclisation of trimethylsilylmethylenecyclopropyl imines provides a stereoselective route to indolizidines via a novel cascade sequence.
Chemokine receptor binding heterocyclic compounds with enhanced efficacy
申请人:Bridger J. Gary
公开号:US20050059702A1
公开(公告)日:2005-03-17
Compounds that interact with the CXCR4 receptor are described. These compounds are useful in treating, for Example, HIV infection and inflammatory conditions such as rheumatoid arthritis, as well as asthma or cancer, and are useful in methods to elevate progenitor and stem cell counts as well as methods to elevate white blood cell counts.