Palladium-Catalyzed Aerobic Dehydrogenation of Substituted Cyclohexanones to Phenols
作者:Yusuke Izawa、Doris Pun、Shannon S. Stahl
DOI:10.1126/science.1204183
日期:2011.7.8
ortho-dimethylaminopyridine ligand, for the conversion of substituted cyclohexanones to the corresponding phenols. The reaction proceeds via successive dehydrogenation of two saturated carbon-carbon bonds of the six-membered ring and uses molecular oxygen as the hydrogen acceptor. This reactivity demonstrates a versatile and efficient strategy for the synthesis of substituted aromatic molecules with fundamentally different
苯酚衍生物由可带有多种取代基的非芳香环化合物制备。芳香分子是许多药物、电子材料和日用塑料的关键成分。这些分子的效用直接反映了芳环上取代基的身份和模式。在这里,我们报告了一种钯 (II) 催化剂体系,结合了非常规的邻二甲氨基吡啶配体,用于将取代的环己酮转化为相应的酚类。该反应通过六元环的两个饱和碳-碳键的连续脱氢进行,并使用分子氧作为氢受体。
Cannabinoid receptor modulators
申请人:Chackalamannil Samuel
公开号:US20070197628A1
公开(公告)日:2007-08-23
A compound having the general structure of Formula (I):
or a pharmaceutically acceptable salt, solvate, or ester thereof, is useful in treating diseases, disorders, or conditions such as obesity, metabolic disorders, addiction, diseases of the central nervous system, cardiovascular disorders, respiratory disorders, and gastrointestinal disorders.
The synthesis of enantiopure (R)- and (S)-4-(3-hydroxy-4,4-dimethyl-2-oxopyrrolidin-1-yl)benzoic acid is described and the corresponding supported chiral acrylate derivative has been used as a dienophile in solid phase asymmetricDiels–Alderreactions with different dienes. In all cases, the reaction gave the expected compound in good yield and with high regio or endo selectivity. Moreover, a high
Tethered Aminohydroxylation (TA) Reaction of Amides
作者:Timothy J. Donohoe、Cedric K. A. Callens、Amber L. Thompson
DOI:10.1021/ol900631y
日期:2009.6.4
The first examples of amide-tethered aminohydroxylationreactions, catalyzed by osmium, showing that the use of N−O-based reoxidants are essential for success, are reported. The system that is described is compatible with a variety of different alkene substitution patterns and ring sizes and works with low loadings in both cyclic and acyclic systems. The levels of diastereoselectivity that were observed