Regioselective Copper-Catalyzed Carboxylation of Allylboronates with Carbon Dioxide
作者:Hung A. Duong、Paul B. Huleatt、Qian-Wen Tan、Eileen Lau Shuying
DOI:10.1021/ol4019375
日期:2013.8.2
In the presence of a Cu(I)/NHC catalyst, the reactions of allylboronic pinacol esters with CO2 (1 atm) are highly regioselective, giving exclusively the more substituted β,γ-unsaturated carboxylic acids in most cases. A diverse array of substituted carboxylic acids can be prepared via this method, including compounds featuring all-carbon quaternary centers.
Reaction of Diketene with Grignard Reagents in the Presence of Cobalt Catalyst. A Convenient Method for the Synthesis of 3-Methylenealkanoic Acids Leading to Terpenoids
Primary alkyl Grignardreagents react regioselectively with diketene in the presence of cobalt(II) iodide to afford 3-methylenealkanoic acids in good yields. The synthetic utility of this reaction is demonstrated in the syntheses of terpenoids by two methods. Utilizing the isomerization of double bond of 3-methylenealkanoic acids, geranic acid and farnesic acid were obtained in two steps. Another method
在碘化钴 (II) 存在下,伯烷基格氏试剂与双烯酮发生区域选择性反应,以良好的收率得到 3-亚甲基链烷酸。该反应的合成效用在通过两种方法合成萜类化合物中得到证明。利用3-亚甲基链烷酸双键异构化,分两步得到香叶酸和法呢酸。另一种方法,即相应烯丙基酯的串联 [3,3] sigmatropic 重排用于合成 C18-天竺葵保幼激素。
Spiropiperidine beta-secretase inhibitors for the treatment of Alzheimer's disease
申请人:Coburn A. Craig
公开号:US20070021454A1
公开(公告)日:2007-01-25
The present invention is directed to spiropiperidine compounds of formula (I)
and tautomers thereof, which are inhibitors of the beta-secretase enzyme and that are useful in the treatment of diseases in which the beta-secretase enzyme is involved, such as Alzheimer's disease. The invention is also directed to pharmaceutical compositions comprising these compounds and the use of these compounds and compositions in the treatment of such diseases in which the beta-secretase enzyme is involved.
Spiropiperidine beta-secretase inhibitors for the treatment of alzheimer's disease
申请人:Merck, Sharp & Dohme Corp.
公开号:US08211904B2
公开(公告)日:2012-07-03
The present invention is directed to spiropiperidine compounds of formula (I)
and tautomers thereof, which are inhibitors of the beta-secretase enzyme and that are useful in the treatment of diseases in which the beta-secretase enzyme is involved, such as Alzheimer's disease. The invention is also directed to pharmaceutical compositions comprising these compounds and the use of these compounds and compositions in the treatment of such diseases in which the beta-secretase enzyme is involved.