Pyridine and pyrimidine derivatives as mGIuR2 antagonists
申请人:McArthur Silvia Gatti
公开号:US20070232583A1
公开(公告)日:2007-10-04
The present invention relates to compounds of formula (I), a process for the manufacture thereof, pharmaceutical compositions containing them, and their use for treating CNS disorders:
wherein A, B, X, Y, R
1
, R
2
, R
3
and R
4
are as defined in the description and claims.
Organocatalytic Enantio- and Diastereoselective Construction of <i>syn</i>-1,3-Diol Motifs via Dynamic Kinetic Resolution of In Situ Generated Chiral Cyanohydrins
syn-1,3-dioxanes as protected 1,3-diols via dynamickineticresolution of in situ generated chiral cyanohydrins has been developed. This method involves a reversible cyanohydrin formation/hemiacetalization/intramolecular oxy-Michael addition reactioncascade, affording a chiral syn-1,3-diol structure with simultaneous construction of two stereogenic centers. The use of trifluoromethyl ketones is crucial
Highly effective asymmetrichydrogenation of β-ketophosphonates in the presence of Ru–(S)-SunPhos as catalyst was realized; good to excellent enantioselectivities (up to 99.9% ee) and excellent diastereoselectivities (96:4) were obtained.
The highly chemo- and enantioselective hydrogenation of (E)-2-substituted-4-oxo-2-alkenoic acids was established for the first time using the Rh/JosiPhos complex, affording a series of chiral α-substituted-γ-keto acids with excellent results (up to 99% yield and >99% ee) and high efficiency (up to 3000 TON). In addition, the importance of this methodology was further demonstrated by a concise and gram-scale
Palladium‐Catalyzed Allylation of Vinylethylene Carbonates with
<i>β</i>
‐Ketophosphonates: Stereoselective Synthesis of (
<i>Z</i>
)‐Homoallylic Phosphonates
A first simple palladiumcatalyzedallylation of vinylethylene carbonates with β‐ketophosphonates has been developed. This method provides access to (Z)‐tri‐ and tetrasubstituted homoallylic phosphonates with exclusive regioselectivity, chemoselectivity and (Z)‐stereoselectivity. The reaction tolerates a wide substrate scope of vinylethylene carbonates and β‐ketophosphonates with electron‐donating