Regioselectivity in a Highly Efficient, Microwave-Assisted Epoxide Aminolysis
作者:Harriet Lindsay、Hinal Desai、Brendan D’Souza、Devin Foether、Benjamin Johnson
DOI:10.1055/s-2007-965927
日期:2007.3
We have developed a microwave-assisted aminolysis of epoxides as an efficient method for synthesizing a number of β-amino alcohols. In most cases, including in reactions of amines with a trisubstituted epoxide, only one equivalent of amine is required to obtain good yields. The reactions are consistently regioselective for amine nucleophiles of varying strengths and for both hindered and unhindered epoxides. In some cases, this regioselectivity could be enhanced by using a polar aprotic or a non-polar solvent.
Solvent-free direct regioselective ring opening of epoxides with imidazoles
作者:Rosario Torregrosa、Isidro M. Pastor、Miguel Yus
DOI:10.1016/j.tet.2006.10.055
日期:2007.1
The reaction of different epoxides with commercially available imidazole at 60 °C leads to the formation of the corresponding 1-(β-hydroxyalkyl)imidazoles in a regioselective manner. When the reaction is applied to a chiral epoxide [(R)-styrene oxide], the expected chiral alcohol is isolated with the same enantiomeric excess. The use of benzimidazole as the heterocyclic component in the same process
piperidine-sulphonamides as potent aromatase inhibitors. Starting from the most promising compounds, here we have synthesised new indazole and triazole derivatives and evaluated their biological activity as potential dual agents, targeting both the aromatase and the inducible nitricoxidesynthase, being this last dysregulated in breast cancer. Furthermore, selected compounds were evaluated as antiproliferative