The potential catalytic activity of selected C,N‐chelated organotin(IV) compounds (e.g. halides and trifluoroacetates) for derivatization of both dimethyl carbonate (DMC) and diethyl carbonate (DEC) was investigated. Some tri‐, di‐ and monoorganotin(IV) species (LCN(n‐Bu)2SnCl (1), LCN(n‐Bu)2SnCl.HCl (1a), LCN(n‐Bu)2SnI (2), LCNPh2SnCl (3), LCNPh2SnI (4), LCN(n‐Bu)SnCl2 (5), LCNSnBr3 (6) and [LCNS
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
An electrochemical Hofmann rearrangement is reported. With the mediation of NaBr, highly corrosive and toxic halogens are avoided. Moreover, this efficient and green approach is well compatible with a broad range of amides, including several commercial medicine derivatives, and provides direct access to synthetically useful carbamates. The synthetic utility of this method is also demonstrated by the
Copper-Catalyzed Coupling of Arylboronic Acids with Potassium Cyanate: A New Approach to the Synthesis of Aryl Carbamates
作者:Ebrahim Kianmehr、Mohammad Hadi Baghersad
DOI:10.1002/adsc.201100153
日期:2011.10
The copper-catalyzedcoupling of aromaticboronicacids with potassium cyanate in the presence of an alcohol has been employed for the synthesis of arylcarbamates. This simple and highly efficient approach can be carried out in air at roomtemperature and, importantly, no base, ligand, or additive is required.
Condensed heteroaromatic ring systems. XVIII. Palladium-catalyzed cross-coupling reaction of aryl bromides with (Z)-1-ethoxy-2-tributylstannylethene and its utilization for construction of condensed heteroaromatics
The palladium-catalyzedcross-coupling reaction of bromobenzenes or bromoheteroarenes such as pyridine, thiophene, indole with (Z)-1-ethoxy-2-tributylstannylethene gives good yields of the corresponding (Z)-1-ethoxy-2-(aryl and heteroaryl)ethenes. This method is effective for introducing an ethoxyethenyl group into an aromatic and heteroaromatic ring and is proved to have versatile utility for the
钯催化的溴苯或溴杂芳烃(如吡啶,噻吩,吲哚)与(Z)-1-乙氧基-2-三丁基锡烷基苯的钯催化交叉偶联反应可得到相应的(Z)-1-乙氧基-2-(芳基和杂芳基)乙烯。该方法可有效地将乙氧基乙烯基引入芳族和杂芳族环中,并被证明具有广泛的用途,可用于由2-溴苯酚,2-溴苯胺和2-溴苯甲酸酯衍生物构建苯并[ b ]呋喃,吲哚,异香豆素环。 。