Efficient Access to Chiral 2-Oxazolidinones via Ni-Catalyzed Asymmetric Hydrogenation: Scope Study, Mechanistic Explanation, and Origin of Enantioselectivity
Cheap transition metal Ni-catalyzed asymmetric hydrogenation of 2-oxazolones was successfully developed, which provided an efficient synthetic strategy to prepare various chiral 2-oxazolidinones with 95%–99% yields and 97%−>99% ee. The gram-scale hydrogenation could be proceeded well with >99% ee in the presence of low catalyst loading (up to 3350 TON). This Ni-catalyzed hydrogenation protocol demonstrated
N-heterocyclic carbene (rNHC) ligands. The octahedral coordination sphere is completed with one CO and one acetonitrile ligand. A monodentate chiraloxazolineligand is used as a chiral auxiliary ligand to obtain enantiomerically pure chiral-at-osmium complexes (>99 : 1 e.r.). Finally, it is demonstrated that the developed chiral-at-osmium complex is suitable for ring-closing enantioselective C(sp3)–H aminations
Stilbene compounds for the prevention and treatment of colon cancer or colon inflammation and methods of using same are provided.
提供了用于预防和治疗结肠癌或结肠炎的双苯乙烯化合物及其使用方法。
SUBSTITUTED PYRAZOLO[1,5-a]PYRIMIDINE COMPOUNDS AS mTOR INHIBITORS
申请人:Andrews Steven W.
公开号:US20120178715A1
公开(公告)日:2012-07-12
Compounds of Formula I: and salts thereof in which R
1
, R
2
, R
2a
, R
3
, n, X and ring B have the meanings given in the specification, are inhibitors of mTOR and are useful in the treatment of diseases which are sensitive to inhibition of mTOR, such as cancers.
Substituted pyrazolo[1,5-a]pyrimidine compounds as mTOR inhibitors
申请人:Andrews Steven W.
公开号:US08865726B2
公开(公告)日:2014-10-21
Compounds of Formula I: and salts thereof in which R1, R2, R2a, R3, n, X and ring B have the meanings given in the specification, are inhibitors of mTOR and are useful in the treatment of diseases which are sensitive to inhibition of mTOR, such as cancers.