本文中,我们描述了一种环境友好且具有成本效益的方案,用于合成有价值的呋喃二甲酸二羧酸酯,首先是通过LiBr和K 2 S 2 O 8对易得的呋喃-2-羧酸酯进行α-溴化反应。此外,然后在醇存在下,在钯催化的还原均偶联反应中进行溴化中间产物5-溴呋喃-2-羧酸酯的合成,得到双呋喃基二羧酸酯。该协议的最终产品之一,[2,2'] bifuran-5,5'-二羧酸酯是聚(呋喃二甲酸乙二酯)的重要单体,可用作传统聚对苯二甲酸乙二醇酯的绿色多用途替代聚合物。 (对苯二甲酸乙二醇酯)目前在工业塑料中很常见。
Dual Role of Rh(III) Catalyst Enables Regioselective Halogenation of (Electron-Rich) Heterocycles
作者:Nils Schröder、Fabian Lied、Frank Glorius
DOI:10.1021/jacs.5b00283
日期:2015.2.4
The Rh(III)-catalyzed selective bromination and iodination of electron-rich heterocycles is reported. Kinetic investigations show that Rh plays a dual role in the bromination, catalyzing the directed halogenation and preventing the inherent halogenation of these substrates. As a result, this method gives highly selective access to valuable halogenated heterocycles with regiochemistry complementary
A quick, mild and efficient bromination using a CFBSA/KBr system
作者:Pan-Pan Jiang、Xian-Jin Yang
DOI:10.1039/c6ra20217a
日期:——
chemistry and brominated compounds as building blocks are of paramount importance in organic synthesis. In our study, we have developed an efficientmethod of bromination by using a CFBSA/KBr system at room temperature in a short reaction time. Notably, this approach has been proven to be applicable to a range of substrates including 1,3-diketones and β-keto esters, phenols, aromatic amines and heteroarenes
The invention relates to compounds of general formula (I) and physiologically acceptable salts and solvates thereof, methods for their preparation and pharmaceutical formulations thereof. ##STR1## wherein Ar represents a substituted phenyl or nitrogen-containing heterocyclic ring; X and Y represent alkylene, alkenylene or alkynylene chains; R.sup.1, R.sup.2 and R.sup.18 each represent hydrogen or alkyl groups; and Q represents an optionally substituted furan or thiophene ring. The compounds of the invention have a stimulant action at .beta..sub.2 -adrenoreceptors and are useful in the treatment of diseases associated with reversible airways obstruction such as asthma and chronic bronchitis.
Spirocyclic Heterocyclic Derivatives And Methods Of Their Use
申请人:Dolle E. Roland
公开号:US20080102031A1
公开(公告)日:2008-05-01
Spirocyclic heterocyclic derivatives, pharmaceutical compositions containing these compounds, and methods for their pharmaceutical use are disclosed. In certain embodiments, the spirocyclic heterocyclic derivatives are ligands of the δ opioid receptor and may be useful, inter alia, for treating and/or preventing pain, anxiety, gastrointestinal disorders, and other δ opioid receptor-mediated conditions.
SPIROCYCLIC HETEROCYCLIC DERIVATIVES AND METHODS OF THEIR USE
申请人:Dolle Roland E.
公开号:US20100029614A1
公开(公告)日:2010-02-04
Spirocyclic heterocyclic derivatives, pharmaceutical compositions containing these compounds, and methods for their pharmaceutical use are disclosed. In certain embodiments, the spirocyclic heterocyclic derivatives are ligands of the δ opioid receptor and may be useful, inter alia, for treating and/or preventing pain, anxiety, gastrointestinal disorders, and other δ opioid receptor-mediated conditions.