Preparation and applications of a polymer-supported phosphoryl azide
作者:Yuhua Lu、Richard T. Taylor
DOI:10.1016/j.tetlet.2003.10.066
日期:2003.12
A polymer-supported diphenylphosphoryl azide was prepared. This polymer-supported version of DPPA is useful due to its lower toxicity, moisture tolerance and ease of workup after reaction. The synthetic application of this solid-phase reagent was explored by conversion of a variety of carboxylic acids to urethanes and ureas through Curtius rearrangement reactions. Carboxylic acids bearing different
Catalyst-free synthesis of substituted pyridin-2-yl, quinolin-2-yl, and isoquinolin-1-yl carbamates from the corresponding hetaryl ureas and alcohols
作者:Svetlana O. Kasatkina、Kirill K. Geyl、Sergey V. Baykov、Irina A. Boyarskaya、Vadim P. Boyarskiy
DOI:10.1039/d1ob00783a
日期:——
catalyst-free synthesis of N-pyridin-2-yl, N-quinolin-2-yl, and N-isoquinolin-1-yl carbamates utilizes easily accessible N-hetaryl ureas and alcohols. The proposed environmentally friendly technique is suitable for the good-to-high yielding synthesis of a wide range of N-pyridin-2-yl or N-quinolin-2-yl substituted carbamates featuring electron-donating and electron-withdrawing groups in the azine rings
N-吡啶-2-基、N-喹啉-2-基和N-异喹啉-1-基氨基甲酸酯的新型无催化剂合成利用容易获得的N-杂芳基脲和醇。所提出的环保技术适用于从良好到高产率合成各种N-吡啶-2-基或N-quinolin-2-yl 取代的氨基甲酸酯,其在吖嗪环中具有给电子和吸电子基团,并且在氧原子处含有各种伯、仲甚至叔烷基取代基(48-94%;31 个例子)。DFT计算和实验研究表明,反应是通过异氰酸异氰酸杂酯中间体的形成进行的。该方法可用于获得N-异喹啉-1-基氨基甲酸酯,但收率较低,苯并[ h ]喹啉-2-基氨基甲酸乙酯也已成功合成(68%)。
Chloroformate Free, Scalable Approach for the Synthesis of Organic Carbamates and Their Alkylation
作者:Mukesh P. Shewalkar、Ramakrishna R. Rao、Veerbhadra Reddy、Sunil N. Darandale、Devanand B. Shinde
DOI:10.2174/157017813805077280
日期:2013.1.1
A convenient method for the synthesis of organic carbamates of 2-aminopyridine without using hazardous chloroformate reagent is developed. This alternate approach for the synthesis of organic carbamates and their alkylation to 2-alkylaminopyridines is more practical and economical to be used on large scale. The amazing behavior of 2- aminopyridine helps in forming organic carbamates unlike 3-aminopyridine and 4-aminopyridine.
Unexpected Reaction of Oximinoacetoacetate with Amines: A Novel Synthesis of Carbamates
作者:Ibrahim Elghamry
DOI:10.1080/00397910802564741
日期:2009.7.29
Abstract The synthesis of alkyl carbamates by a solvent-free reaction of oximinoacetoacetate and amine at 130°C is reported. A preliminary mechanism to this unexpected reaction is also given.
Mono, bi- and trinuclear metal complexes derived from new benzene-1,4-bis(3-pyridin-2-ylurea) ligand. Spectral, magnetic, thermal and 3D molecular modeling studies
作者:Mosad A. El-ghamry、Akila A. Saleh、Saied M.E. Khalil、Amira A. Mohammed
DOI:10.1016/j.saa.2013.03.016
日期:2013.6
bis-deprotonated form. The complexes were characterized by elemental and thermal analyses, IR, electronic and mass spectra as well as conductance and magnetic susceptibility measurements. The results showed that the metal complexes exhibited different geometrical arrangements such as squareplanar, tetrahedral, octahedral and square pyramidal arrangements. The Coats–Redfern equation was used to calculate the kinetic