Action des dialkylcuprates de lithium sur les aldéhydes α,β -éthylénioues
作者:C. Chuit、J.P. Foulon、J.F. Normant
DOI:10.1016/0040-4020(80)80126-8
日期:1980.1
Nearly exclusive 1-4 addition produts obtained by action of lithium dialkylcuprates with α,β ethylenic aldehydes. Non polar solvents and low temperatures favour this reaction .Only α,β-ehylenic aldehydes having a trisubstituted double bond give a relatively important proportation of 1–2 addition product.
Asymmetric Total Synthesis and Biological Evaluation of the Natural PDE4 Inhibitor Toddacoumalone
作者:Ke-Qiang Hou、Xue-Ping Chen、Yiyou Huang、Albert S. C. Chan、Hai-Bin Luo、Xiao-Feng Xiong
DOI:10.1021/acs.orglett.9b04355
日期:2020.1.17
We describe herein the first asymmetric totalsynthesis and biologicalevaluation of the natural PDE4 inhibitor toddacoumalone and its stereoisomers. The key step of the totalsynthesis is a formal asymmetric [4 + 2] cycloaddition reaction catalyzed by chiral secondary amine catalysts. A variety of pyranoquinolinones and 3-methylcrotonaldehyde are well tolerated under the optimized reaction conditions
NOVEL METHOD FOR PRODUCING 5, 5-DISUBSTITUTED-4, 5-DIHYDROISOXAZOLE
申请人:KUMIAI CHEMICAL INDUSTRY CO., LTD.
公开号:US20210047280A1
公开(公告)日:2021-02-18
The present invention addresses the problem of providing an industrially preferable, economical, and environmentally friendly method for producing the 4,5-dihydroisoxazole represented by a formula (3).
The present invention enables the compound of a formula (3) to be produced by reacting the compound of a formula (2) according to the reaction represented by a reaction formula in the presence of an acid catalyst.
Cobalt‐Catalyzed Reductive Dimethylcyclopropanation of 1,3‐Dienes
作者:Jacob Werth、Christopher Uyeda
DOI:10.1002/anie.201807542
日期:2018.10.15
variant of the Simmons–Smith reaction that enables the efficient dimethylcyclopropanation of 1,3‐dienes using a Me2CCl2/Zn reagent mixture. The reactions proceed with high regioselectivity based on the substitution pattern of the 1,3‐diene. The products are vinylcyclopropanes, which serve as substrates for transition‐metal‐catalyzed ring‐opening reactions, including 1,3‐rearrangement and [5+2] cycloaddition
PYRANOCHROMENYL PHENOL DERIVATIVE, AND PHARMACEUTICAL COMPOSITION FOR TREATING METABOLIC SYNDROME OR INFLAMMATORY DISEASE
申请人:ERUM BIOTECHNOLOGIES, INC.
公开号:US20160272650A1
公开(公告)日:2016-09-22
Provided are a pyranochromenyl phenol derivative, a pharmaceutically acceptable salt thereof, or a solvate thereof. Also provided is a pharmaceutical composition for preventing or treating metabolic syndrome or inflammatory disease comprising same.
The present invention is efficacious in preventing or treating metabolic syndrome or inflammatory disease and is chemically stable.