The synthesis of 3 -aryl-N-n-propyl-piperidines is described in six steps starting from a-sulfonyl acetamide via the formal [3+3] cycloaddition reaction of the latter into glutarimide. The pathway involves an efficient cycloaddition and regioselective reduction, and yields useful building blocks for heterocyclic chemistry. (C) 2002 Elsevier Science Ltd. All rights reserved.
The intermolecular reductive coupling of aromatic ketones with acylimidazoles was effected by electroreduction in the presence of chlorotrimethylsilane and gave α-trimethylsiloxy ketones and esters. The best result was obtained using Bu4NPF6 as a supporting electrolyte and a Pb cathode in THF. The α-trimethylsiloxy-containing products were transformed to the corresponding α-hydroxy ketones and esters
Highly Regioselective Friedel–Crafts Reactions of Electron-Rich Aromatic Compounds with Pyruvate Catalyzed by Lewis Acid-Base: Efficient Synthesis of Pesticide Cycloprothrin
An efficient synthesis of aromatic lactate esters is reported via highly regioselective Friedel–Crafts reactions of electron-richaromaticcompounds with pyruvate ester promoted by TiCl4 in the presence of basic Al2O3. The utility of the reaction is shown by the efficient synthesis of the pesticide cycloprothrin in high yield.
芳族乳酸酯的有效的合成报道通过用丙酮酸酯通过的TiCl促进富电子的芳族化合物的高度选择性Friedel-Crafts反应4在基本Al的存在2 Ó 3。该反应的实用性以高产率高效合成了农药环丙菊酯显示出来。