Preparation of mono-substituted malonic acid half oxyesters (SMAHOs)
作者:Tania Xavier、Sylvie Condon、Christophe Pichon、Erwan Le Gall、Marc Presset
DOI:10.3762/bjoc.17.135
日期:——
The use of mono-substituted malonic acid half oxyesters (SMAHOs) has been hampered by the sporadic references describing their preparation. An evaluation of different approaches has been achieved, allowing to define the best strategies to introduce diversity on both the malonic position and the ester function. A classical alkylation step of a malonate by an alkyl halide followed by a monosaponification
Cyano Diels−Alder and Cyano Ene Reactions. Applications in a Formal [2 + 2 + 2] Cycloaddition Strategy for the Synthesis of Pyridines
作者:Takeo Sakai、Rick L. Danheiser
DOI:10.1021/ja106901u
日期:2010.9.29
Two metal-free, formal [2 + 2 + 2] cycloaddition strategies for the construction of polycyclic pyridine derivatives are described that proceed via pericyclic cascade mechanisms featuring the participation of unactivated cyano groups as enophile and dienophile cycloaddition partners.
Benzenesulphonamidopyridyl compounds which are useful as thromboxane A.sub.
申请人:Smith Kline & French Laboratories Limited
公开号:US04902698A1
公开(公告)日:1990-02-20
The invention provides a class of alkanoic acids substituted with a benzenesulphonamidopyridyl group. The compounds have activity as thromboxane A.sub.2 -antagonists.
本发明提供了一类取代苯磺酰胺吡啶基的脂肪酸。这些化合物具有作为血栓素A.sub.2-拮抗剂的活性。
Microwave-Enhanced Rhodium-Catalyzed [2+2+2] Cycloaddition Reactions To Afford Highly Functionalized Pyridines and Bipyridines
Rhodium(I)-catalyzed [2+2+2] cycloaddition reactions of N-tosyl-, carbon-, and oxygen-tethered cyanodiynes in a completely intramolecular fashion have been optimized to afford highly functionalized pyridines by conventional and/or microwave heating. Microwaves have been shown to enhance the process by allowing the reaction to be conducted effectively in short reaction times. The methodology has been