Accessing Skeletal Diversity Using Catalyst Control: Formation of n and n + 1 Macrocyclic Triazole Rings
摘要:
A regloselective intramolecular Huisgen cycloaddition was performed on various azido alkyne substrates giving rise to macrocyclic triazole rings. Using catalyst control, a common intermediate has been converted to two structurally unique macrocycles with either a 1,5- or a 1,4-triazole resulting in an n or n + 1 ring size. This is the first example of an intramolecular ruthenium-catalyzed Huisgen cycloaddition.
The Huisgen 1,3-dipolar cycloaddition is a ‘click’ reaction that results from the ligation of azides and alkynes to give a triazole moiety. This reaction has been shown to be effective in the formation of a variety of macrocyclic rings. A key point of interest is the regioselectivity and specificity of the cycloaddition. Disclosed herein are specific, selective, and high-yielding methods of azide-alkyne macrocyclization to form 1,4- and 1,5-triazoles and libraries thereof.
Accessing Skeletal Diversity Using Catalyst Control: Formation of <i>n</i> and <i>n</i> + 1 Macrocyclic Triazole Rings
作者:Ann Rowley Kelly、Jingqiang Wei、Sarathy Kesavan、Jean-Charles Marié、Nicole Windmon、Damian W. Young、Lisa A. Marcaurelle
DOI:10.1021/ol900562u
日期:2009.6.4
A regloselective intramolecular Huisgen cycloaddition was performed on various azido alkyne substrates giving rise to macrocyclic triazole rings. Using catalyst control, a common intermediate has been converted to two structurally unique macrocycles with either a 1,5- or a 1,4-triazole resulting in an n or n + 1 ring size. This is the first example of an intramolecular ruthenium-catalyzed Huisgen cycloaddition.