Influence of Hydroxylamine Conformation on Stereocontrol in Pd-Catalyzed Isoxazolidine-Forming Reactions
摘要:
Palladium-catalyzed carboamination reactions between N-Boc-O-(but-3-enyl)hydroxylamine derivatives and aryl or alkenyl bromides afford cis-3,5- and trans-4,5-disubstituted isoxazolidines in good yield with up to >20:1 dr. The diastercoselectivity observed in the formation of cis-3,5-disubstituted isoxazolidines is superior to selectivities typically obtained in other transformations, such as 1,3-dipolar cycloaddition reactions, that provide these products. In addition, the stereocontrol in the C-N bond-forming Pd-catalyzed carboamination reactions of N-Boc-O-(but-3-enyl)hydroxylamines is significantly higher than that of related C-O bond-forming carboetherification reactions of N-benzyl-N-(but-3-enyl)hydroxylamine derivatives. This is likely due to a stereoelectronic preference for cyclization via transition states in which the Boc group is placed in a perpendicular orientation relative to the plane of the developing ring, which derives from the conformational equilibria of substituted hydroxylamines.
Provided herein are myeloid cell leukemia 1 protein (Mcl-1) inhibitors, methods of their preparation, related pharmaceutical compositions, and methods of using the same. For example, provided herein are compounds of Formula I,
and pharmaceutically acceptable salts thereof and pharmaceutical compositions containing the compounds. The compounds and compositions provided herein may be used, for example, in the treatment of diseases or conditions, such as cancer.
US6194458B1
申请人:——
公开号:US6194458B1
公开(公告)日:2001-02-27
[EN] BENZAMIDE POTASSIUM CHANNEL INHIBITORS<br/>[FR] INHIBITEURS BENZAMIDIQUES DE CANAUX POTASSIQUES
申请人:MERCK & CO INC
公开号:WO2000025774A1
公开(公告)日:2000-05-11
This invention relates to benzamide potassium channel inhibitors of general structural formula (I). The compounds of this invention are useful in the treatment of autoimmune diseases, the prevention of rejection of foreign organ transplants and related afflictions, diseases and illnesses, and cardiac arrhythmias. Also within the scope of this invention are pharmaceutical formulations comprising a compound of formula (I) and a pharmaceutical carrier, as well as pharmaceutical formulations comprising a compound of formula (I), one or more immunosuppressive compounds and a pharmaceutical carrier.