Chemoselective Synthesis of Carbamates using CO<sub>2</sub>as Carbon Source
作者:Daniel Riemer、Pradipbhai Hirapara、Shoubhik Das
DOI:10.1002/cssc.201600521
日期:2016.8.9
Synthesis of carbamates directly from amines using CO2 as the carbon source is a straightforward and sustainable approach. Herein, we describe a highly effective and chemoselective methodology for the synthesis of carbamates at room temperature and atmospheric pressure. This methodology can also be applied to protect the amino group in amino acids and peptides, and also to synthesize important pharmaceuticals
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.
Catalytic Activity of MCM-41–TBD in the Selective Preparation of Carbamates and Unsymmetrical Alkyl Carbonates from Diethyl Carbonate
作者:Silvia Carloni、Dirk E. De Vos、Pierre A. Jacobs、Raimondo Maggi、Giovanni Sartori、Raffaella Sartorio
DOI:10.1006/jcat.2001.3439
日期:2002.1
The synthesis of carbamates 3 and unsymmetrical alkyl carbonates 5 by reaction of diethyl carbonate with aliphatic amines or alcohols has been realized by using as heterogeneous catalyst a hybrid organic–inorganic material prepared by anchoring TBD to MCM-41 silica. Products are obtained in high yield and very good selectivity and the solid catalyst can be recovered simply by filtration and reused
This invention relates to a range of alpha substituted 2-benzyl substituted imidazole compounds and pharmaceutically acceptable salts and solvates thereof, to compositions comprising such compounds, processes for their synthesis and their use as parasiticides.