Asymmetric Hydrogenation of α,β-Unsaturated Nitriles with Base-Activated Iridium N,P Ligand Complexes
作者:Marc-André Müller、Andreas Pfaltz
DOI:10.1002/anie.201402053
日期:2014.8.11
Although many chiralcatalysts are known that allow highly enantioselective hydrogenation of a wide range of olefins, no suitable catalysts for the asymmetric hydrogenation of α,β‐unsaturated nitriles have been reported so far. We have found that Ir N,P ligand complexes, which under normal conditions do not show any reactivity towards α,β‐unsaturated nitriles, become highly active catalysts upon addition
Photocatalytic, Phosphoranyl Radical-Mediated N–O Cleavage of Strained Cycloketone Oximes
作者:Peng-Ju Xia、Zhi-Peng Ye、Yuan-Zhuo Hu、Dan Song、Hao-Yue Xiang、Xiao-Qing Chen、Hua Yang
DOI:10.1021/acs.orglett.9b00651
日期:2019.4.19
A photoinduced, phosphoranyl radical-mediated protocol for the direct N–O cleavage of strained cycloketone oximes via a polar/SET crossover process was developed for the first time. This visible-light-driven direct N–O activation mode for oxime offers beneficial features such as streamlined synthetic process and versatile photochemical reactivities. Consequently, the alkenes and α-trifluoromethyl alkenes
Highly Efficient Rh-Catalyzed Asymmetric Hydrogenation of α,β-Unsaturated Nitriles
作者:Qiaozhi Yan、Duanyang Kong、Meina Li、Guohua Hou、Guofu Zi
DOI:10.1021/jacs.5b06418
日期:2015.8.19
A highly efficient enantioselectivehydrogenation of α,β-unsaturated nitriles catalyzed by Rh-(R,R)-f-spiroPhos complex has been developed. With Rh-(R,R)-f-spiroPhos catalyst and under mild conditions, a wide range of α,β-unsaturated nitriles including the (E)- and (Z)-isomers of 3-alkyl-3-aryl, 3,3-diaryl, and 3,3-dialkyl α,β-unsaturated nitriles were hydrogenated to the corresponding chiral nitriles
Substituted and unsubstituted naphthalenyl-3H-1,2,3,5-oxthiadiazole 2-oxides
申请人:AMERICAN HOME PRODUCTS CORPORATION
公开号:EP0393940A1
公开(公告)日:1990-10-24
This invention relates to compounds of structural formula (I)
and tautomeric forms thereof wherein R¹ and R² are independently hydrogen, lower alkyl containing 1 to 6 carbon atoms, alkoxy containing 1 to 6 carbon atoms, ethynyl, methylthio, nitro, halogen,nitrile, trifluoro-methyl, vinyl or benzyloxy in which the phenyl group is optionally substituted by one or more substituents selected from halogen,lower alkyl containing 1 to 6 carbon atoms and alkoxy containing 1 to 6 carbon atoms; Z is
wherein R³ is hydrogen, lower alkyl containing 1 to 3 carbon atoms, alkoxy containing 1 to 2 carbon atoms, or benzyl; R⁴ is lower alkyl containing 1 to 3 carbon atoms, alkoxy containing 1 to 2 carbon atoms, or benzyl; n¹ is 0, 1 or 2; n² is 0, 1 or 2; or Z is -S-CH₂-, -SO₂-CH₂, or -OCH₂-; or Z is -C(R⁵)=C(R⁶)-, wherein R⁵ and R⁶ are independently hydrogen or lower alkyl containing 1 to 3 carbon atoms and their pharmaceutically acceptable salts. The compounds have pharmaceutical properties which render them beneficial for the treatment of diabetes mellitus and associated conditions. The invention also provides processes for their preparation, methods of using the compounds and pharmaceutical compositions containing them.
Antihyperglycemic activity of novel naphthalenylmethyl-3H-1,2,3,5-oxathiadiazole 2-oxides
作者:John W. Ellingboe、Louis J. Lombardo、Thomas R. Alessi、Thomas T. Nguyen、Frieda Guzzo、Charles J. Guinosso、James Bullington、Eric N. C. Browne、Jehan F. Bagli
DOI:10.1021/jm00069a006
日期:1993.8
A series of naphthalenyl 3H-1,2,3,5-oxathiadiazole 2-oxides was prepared and tested for antihyperglycemic activity in the db/db mouse, a model for type 2 (non-insulin dependent) diabetes mellitus. Substitution at the 1-, 5-, or 8-positions of the naphthalene ring with a halogen was found to be beneficial to antihyperglycemic activity. 4-[(5-Chloronaphthalen-2-yl)methyl]-3H-1,2,3,5-oxathiadiazole 2-oxide (45), one of the most potent compounds in this series, was selected for further pharmacological evaluation.