The invention provides a compound of formula (I): wherein R1, and W have any of the values defined in the application; or a salt thereof. The compounds and salts thereof have beneficial therapeutic properties (e.g. immunosuppressant properties).
Regioselective Metalations of Pyrimidines and Pyrazines by Using Frustrated Lewis Pairs of BF<sub>3</sub>⋅OEt<sub>2</sub>and Hindered Magnesium- and Zinc-Amide Bases
作者:Klaus Groll、Sophia M. Manolikakes、Xavier Mollat du Jourdin、Milica Jaric、Aleksei Bredihhin、Konstantin Karaghiosoff、Thomas Carell、Paul Knochel
DOI:10.1002/anie.201301694
日期:2013.6.24
Born of frustration: Using the frustratedLewispairs TMP–metal and BF3⋅OEt2 allows the regioselectivemetalation of pharmaceutically relevant diazines, such as pyrimidines, purines, and pyrazines. These metalations are often complementary to prior deprotonations performed without BF3⋅OEt2. Especially attractive is a new sequential regioselective full functionalization of the pyrazine scaffold with a bulky