The invention relates to novel pyrazolo[1,5-A]pyrimidine compounds of Formula I
in which all the variables are as defined in the specification; to their preparation and to their use as Lck kinase inhibitors.
Asymmetric total synthesis of ( R )-α-cuparenone, ( S )-cuparene and formal synthesis of ( R )-β-cuparenone through Meinwald rearrangement and ring closing metathesis (RCM) reaction
作者:Rajan Kumar、Joydev Halder、Samik Nanda
DOI:10.1016/j.tet.2016.12.072
日期:2017.2
Asymmetricsynthesis of enantiopure cuparenoid sesquiterpenes (R)-α-cuparenone, (S)-cuparene and a formal synthesis of (R)-β-cuparenone was presented in this article. Meinwald rearrangement of an enantiopure trisubstituted 2,3-epoxy alcohol derivative was the key reaction employed to construct the quaternary streocenter in the target molecules. Ring closing metathesis (RCM) reaction was explored in