formation of functionalized nitrones from N-hydroxyamides was reported. The reaction took place through two types of iridium-catalyzed reactions including dehydrosilylation and hydrosilylation. The method showed high chemoselectivity in the presence of sensitive functional groups, such as methyl esters, and was successfully applied to the synthesis of cyclic and macrocyclic nitrones, which are known to be
报道了 Ir 催化从 N-羟基酰胺还原形成官能化硝酮。该反应通过两种类型的铱催化反应进行,包括脱氢硅烷化和氢化硅烷化。该方法在敏感官能团(如甲酯)的存在下显示出高化学选择性,并成功应用于环状和大环硝酮的合成,已知这些化合物很难通过常规方法获得。(1) H NMR 研究强烈支持生成 N-甲硅烷氧基酰胺和 N,O-缩醛作为实际中间体。
Lactam and cyclic urea derivatives useful as alpha 1a adrenoceptor antagonists
申请人:Merck & Co., Inc.
公开号:US06326372B1
公开(公告)日:2001-12-04
Lactam and cyclic urea derivatives and their pharmaceutically acceptable salts are disclosed. The synthesis of these compounds and their use as alpha 1a adrenergic receptor antagonists is also described. One application of these compounds is in the treatment of benign prostatic hyperplasia. These compounds are typically selective in their ability to relax smooth muscle tissue enriched in the alpha 1a receptor subtype without at the same time inducing hypotension. One such tissue is found surrounding the urethral lining. Therefore, one utility of the instant compounds is to provide acute relief to males suffering from benign prostatic hyperplasia, by permitting less hindered urine flow. Another utility of the instant compounds is provided by combination with a human 5-alpha reductase inhibitory compound, such that both acute and chronic relief from the effects of benign prostatic hyperplasia can be achieved.
This article describes the full details of our reductive approach to nitrones from amides. Reduction of N-siloxyamides with the Schwartz reagent [Cp2ZrHCl], followed by addition of an acid provided functionalized nitrones. The developed conditions were then extended to a catalytic version with the Vaska complex [IrCl(CO)(PPh3)2] and (Me2HSi)2O starting from N-hydroxyamides. 1H NMR studies of the Ir-catalyzed
Cyclic<i>O</i>-Acyloximes as Novel Photolatent Bases
作者:Kanji Suyama、Tomohiro Inoue、Masamitsu Shirai
DOI:10.1246/cl.2010.362
日期:2010.4.5
Cyclic O-acyloximes were prepared as novel photolatent bases with good photoreactivity and thermal stability. They were transformed into cyclic imines on irradiation at 254 nm and showed higher crosslinking ability for poly(glycidyl methacrylate) compared with an O-acyloxime with noncyclic structure.