Synthesis of Imidazoles and Oxazoles via a Palladium-Catalyzed Decarboxylative Addition/Cyclization Reaction Sequence of Aromatic Carboxylic Acids with Functionalized Aliphatic Nitriles
efficient approach for the assembly of multiply substituted imidazoles and oxazoles in a single-step manner. These transformations are based on a decarboxylation addition and annulation of readily accessible aromatic carboxylic acids and aliphatic nitriles and exhibit good functional group compatibility and a high step economy. The reaction is scalable, and as-prepared products could be transformed into practical
A Convenient and Improved Method for the Preparation of Cyanohydrin Esters from Acyl Cyanides and Aldehydes
作者:Mitsuhiro Okimoto、Toshiro Chiba
DOI:10.1055/s-1996-4361
日期:1996.10
Various kinds of cyanohydrin esters can be obtained in good to excellent yields from aldehydes by treatment with acyl cyanides in a heterogeneous mixture of aqueous potassium carbonate and acetonitrile.
A palladium‐catalyzed tandem reaction of cyanomethyl benzoates with arylboronic acids has been achieved. Substitution at the 2‐position of cyanomethyl benzoates was found to be crucial for the selective synthesis of oxazoles and isocoumarins. Cyanomethyl benzoates afforded 2,4‐diaryloxazoles as products, while 2‐benzoyl‐substituted cyanomethyl benzoates delivered 3‐benzoyl‐4‐aryl‐isocoumarins selectively
One-Pot Three-Component Solvent-Free Cyanoaroylation of Aldehydes Using Potassium Hexacyanoferrate(II) as an Environmentally Benign Cyanide Source
作者:Zheng Li、Guoqiang Tian、Yuanhong Ma
DOI:10.1055/s-0030-1258495
日期:2010.9
three-component solvent-tree cyanoaroylation of aldehydes usingpotassiumhexacyanoferrate(II) as an environmentally benign cyanidesource and triethylamine as a catalyst has been described. This method has advantages of not using strongly toxic cyanating agents and volatile organic solvents. In addition, the product was obtained in high yield using a simple workup procedure.
已经描述了一种使用六氰基高铁酸钾 (II) 作为环境友好的氰化物源和三乙胺作为催化剂的醛的一锅三组分溶剂树氰基芳酰化的有效方法。该方法具有不使用剧毒氰化剂和挥发性有机溶剂的优点。此外,使用简单的后处理程序以高产率获得了产物。
Construction of Functionalized α-Imino Ketones via Pd-Catalyzed C–H Addition to Nitriles/Aerobic Oxidation Sequences
Pd(II)-catalyzed addition of sp2 C–H to nitrile/aerobic oxidation sequences for the preparation of functionalized α-imino ketones is described in which readily available heteroarenes and O-acyl cyanohydrins were employed. Various functionalized targeted molecules can be prepared in good yields with high atom and step economy. Moreover, a broad substrate scope and the ready manipulation and availability