chloride and titanium(IV) chloride could be used as Lewis acids in place of tin(IV) chloride. Various nitroarenes were transformed into corresponding carbamate in moderate to excellent yields with the platinum catalyst.
铂催化剂与三苯基膦、氯化锡 (IV) 和三乙胺结合,在 180 °C 和 60 kg cm-2 的一氧化碳下,对硝基芳烃在乙醇中的还原性 N-羰基化显示出高活性。由硝基苯以83%的产率获得苯基氨基甲酸乙酯。氯化铁 (III)、氯化铝和氯化钛 (IV) 可用作路易斯酸代替氯化锡 (IV)。在铂催化剂的作用下,各种硝基芳烃以中等至极好的收率转化为相应的氨基甲酸酯。
Cyanomethyl Anion/Carbon Dioxide System: An Electrogenerated Carboxylating Reagent. Synthesis of Carbamates under Mild and Safe Conditions
A new carboxylating reagent ((-)CH(2)CN/CO(2)) was obtained by bubbling CO(2) in a CH(3)CN-TEAP (tetraethylammonium perchlorate) solution previously electrolyzed under galvanostatic control. Organic carbamates were isolated from these solutions after addition of amines and an alkylating agent. In this paper, we describe the optimized conditions for the electrochemical synthesis of carbamates from amines
The reaction of amines with an electrogenerated base. Improved synthesis of arylcarbamic esters
作者:Marta Feroci、Achille Inesi、Leucio Rossi
DOI:10.1016/s0040-4039(99)02180-2
日期:2000.2
The electrogenerated base of 2-pyrrolidone reacts with amines and anilines yielding the corresponding alkyl and arylcarbamates, after addition of carbon dioxide and ethyl iodide. Arylcarbamic esters are obtained in very good yields under mild reaction conditions with respect to the methods so far reported.
Teaching Old Compounds New Tricks: DDQ-Photocatalyzed C−H Amination of Arenes with Carbamates, Urea, and N-Heterocycles
作者:Somnath Das、Palani Natarajan、Burkhard König
DOI:10.1002/chem.201705442
日期:2017.12.22
The C-H amination of benzene derivatives was achieved using DDQ as photocatalyst and BocNH2 as the amine source under aerobic conditions and visible light irradiation. Electron-deficient and electron-rich benzenes react as substrates with moderate to good product yields. The amine scope of the reaction comprises Boc-amine, carbamates, pyrazoles, sulfonimides and urea. Preliminary mechanistic investigations