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.
通过在水性碳酸钾和乙腈的异相混合物中用酰基氰化物处理醛,可以获得多种氰醇酯,收率良好至优异。
Synthesis of 2,4,5-Trisubstituted Oxazoles via Pd-Catalyzed C–H Addition to Nitriles/Cyclization Sequences
作者:Di Zhang、Hao Song、Na Cheng、Wei-Wei Liao
DOI:10.1021/acs.orglett.9b00700
日期:2019.4.19
A practical and flexible intermolecular protocol for the diverse synthesis of trisubstituted oxazole derivatives via a Pd-catalyzed direct C–H addition of electronic-rich heteroarenes to O-acyl cyanohydrins bearing an α-hydrogen/cyclization sequence is described. A wide range of trisubstituted oxazoles can be prepared from readily available starting materials in good to high yields with high efficiency
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
DABCO-Mediated Synthesis and Biological Activity of Cyanohydrin Esters
作者:H. M. R. Hoffmann、Z. M. Ismail、Reiner Hollweg、Abdul R. Zein
DOI:10.1246/bcsj.63.1807
日期:1990.6
Cyanohydrinesters 1–31 have been prepared from α-ketonitriles and aldehydes using DABCO (1,4-diazabicyclo[2.2.2] octane) as nucleophilic acylation catalyst. The modified piperonal 8 was found to inhibit the formation of thromboxane synthetase.