study on the iodine-mediated phosphoramidation reaction of amines and trialkyl phosphites was conducted, which not only disclosed the factors affecting the reaction but also revealed that it could proceed smoothly in CH2Cl2 at room temperature in open air. Using this method, various phosphoramidates with different aliphatic amines and aromatic amines were synthesized in good to excellent yields. Our
Strategic applications of Baylis–Hillman adducts to general syntheses of 3-nitroazetidines
作者:Ankita Rai、Lal Dhar S. Yadav
DOI:10.1039/c1ob06274c
日期:——
A novel one-pothighly diastereoselective synthesis of substituted 3-nitroazetidines via an anionic domino process is described. The synthesis involves a high yielding annulation of Baylis–Hillman alcohols and their aldehydes with either N-aryl/tosylphosphoramidates or N-aryl/tosylphosphoramidates in combination with a task-specificionicliquid [bmim][X–Y] to afford the corresponding 1,2,3-tri- and
A convenient synthesis of 1,2,4-trisubstituted azetidines by reductive cyclization of aza-Michael adducts of chalcones
作者:Lal Dhar S. Yadav、Chhama Awasthi、Vijai K. Rai、Ankita Rai
DOI:10.1016/j.tetlet.2007.09.044
日期:2007.11
Aza-Michael adducts of chalcones and diethyl N-arylphosphoramidates undergo reductive cyclization with sodium borohydride followed by sodium hydride to afford 1,2,4-trisubstituted azetidines diastereoselectively in a one-pot procedure and excellent yields.
We describe the use of visible light in conjunction with an organic dye for the synthesis of phosphoramidates. Cross dehydrogenative coupling reactions between phosphites and amines are reported using organic dyes and light as catalysts for the first time. It is not only a novel application of organic dyes but also fulfils the requirement of sustainability and green chemistry avoiding the use of chromatographic
Iodine catalyzed solvent-free cross-dehydrogenative coupling of arylamines and H-phosphonates for the synthesis of N-arylphosphoramidates under atmospheric conditions
作者:Bashir Ahmad Dar、Nisar A. Dangroo、Amit Gupta、Aarti Wali、Mohammad Akbar Khuroo、Ram A. Vishwakarma、Baldev Singh
DOI:10.1016/j.tetlet.2014.01.064
日期:2014.2
Aerobic oxidative coupling of various arylamines and H-phosphonates to the corresponding N-arylphosphoramidates has been achieved under solvent-free conditions using molecular iodine. This protocol works at room temperature furnishing the corresponding P-N coupling products in moderate to high yields. (C) 2014 Elsevier Ltd. All rights reserved.