Synthesis of ferrocenyl- and hetaryl-substituted 2,2,2-trifluoroethanols and their conversion into 2,2,2-trifluoroethanethiols using Lawesson’s reagent
with the Ruppert-Prakash reagent and, after desilylation of the intermediate adduct, gave the corresponding tertiary 2,2,2-trifluoroethanols. Similarly, ferrocenyl carbaldehyde was converted into 1-ferrocenyl-2,2,2-trifluoroethanol via nucleophilic trifluoromethylation. Some of the obtained fluorinated alcohols were transformed into thiols by treatment with Lawesson’s reagent or P2S5·2C5H5N complex.
二茂铁基和杂芳基取代的酮与Ruppert-Prakash试剂平稳反应,并且在中间加合物甲硅烷基化后,得到相应的叔2,2,2-三氟乙醇。类似地,二茂铁基甲醛通过亲核三氟甲基化转化为1-二茂铁基-2,2,2-三氟乙醇。通过使用Lawesson试剂或P 2 S 5 ·2C 5 H 5 N络合物处理,将所得的某些氟化醇转化为硫醇。显着地,所获得的硫醇是无味的化合物。
One-Pot Synthesis of Arylketones from Aromatic Acids via Palladium-Catalyzed Suzuki Coupling
A palladium-catalyzed one-pot procedure for the synthesis of aryl ketones has been developed. Triazine esters when coupled with aryl boronic acids provided aryl ketones in moderate to excellent yields (up to 95%) in the presence of 1 mol % Pd(PPh3)2Cl2 for 30 min.
The Surfactant-Promoted Cross-Coupling Reactions of Arylboronic Acids with Carboxylic Anhydrides or Acyl Chlorides in Water
作者:Yuhong Zhang、Bingwei Xin、Kai Cheng
DOI:10.1055/s-2007-983729
日期:2007.7
The palladium(II) chloridecatalyzedcross-coupling of arylboronic acids with carboxylic anhydrides or acylchlorides in water in the presence of various surfactants is described. The inexpensive and industrially widely used sodium dodecyl sulfate (SDS) was found to be a good promoter of the coupling reaction and aryl ketones were obtained in good yields without the use of phosphine ligands. The reactions
描述了在各种表面活性剂存在下在水中氯化钯 (II) 催化的芳基硼酸与羧酸酐或酰氯的交叉偶联。发现廉价且工业上广泛使用的十二烷基硫酸钠(SDS)是偶联反应的良好促进剂,并且在不使用膦配体的情况下以良好的收率获得芳基酮。该反应不受芳基硼酸和羧酸衍生物中存在放电子和吸电子取代基的影响,并且在空气中温和条件下获得了多种芳基酮。
Hetaryl Thioketones: Synthesis and Selected Reactions
lithiated heterocycles. Under typical conditions, selected examples of the hetaryl thioketones were oxidized selectively to give thiocarbonyl S-oxides (sulfines). Reactions with diazomethane at –65°C yielded 1,3-dithiolanes in a regioselective manner and hetero-Diels–Alder reactions of 2-thienyl substituted thioketones with dimethyl acetylenedicarboxylate yielded the corresponding 7H-thieno[2,3- c]thiopyran-4
Dihetaryl thioketones react with thiocarbonyl ylides to give 1,3‐dithiolanes in high yields. No competitive side reactions of the thiocarbonyl ylides were observed, evidencing the ‘superdipolarophilic’ character of this less‐known group of thioketones. Depending on the type of substituents present in both the thiocarbonyl ylide and the thioketone, formal [3+2] cycloadditions occur with complete regioselectivity