A Diversified Approach to the Synthesis of Highly Functionalized Novel Azines and Azoles from 2H-Pyran-2-ones
摘要:
One-pot regioselective synthesis of 2,6-diarylpyrimidines (4), 2,6-disubstituted pyridines (5 and 6), 5-aryl-3-cyanomethyl-1H-pyrazoles (7) through base catalyzed ring transformation of suitably functionalized 2H-pyran-2-ones by arylamidines, cyanamide, ammonium carbonate, hydrazines respectively has been developed. Our synthetic approach opened a new avenue for the regioselective synthesis of 2,6-diarylpyrimidines and 2,6-disubstituted pyridines and cyanomethylpyrazoles. The procedure is very simple, efficient and economically viable. The protocol provides an efficient methodology for the preparation of new class of medicinally useful and highly functionalized azines and azoles from single precursor 2H-pyran-2-ones.
Synthesis of thiophenes and pyranone fused thiophenes by base induced inter and intramolecular C–S and C–C bond formation: a non-catalytic approach
作者:Pushyamitra Mishra、Hardesh K. Maurya、Brijesh Kumar、Vishnu K. Tandon、Vishnu Ji Ram
DOI:10.1016/j.tetlet.2011.12.066
日期:2012.2
An efficient and concise one pot synthesis of highly functionalized thiophenes and pyranone fused thiophenes has been delineated through base induced ring transformation of suitably functionalized 2H-pyran-2-ones by ethyl thioglycolate by inter and intramolecular C–S and C–Cbondformation.
高碱化噻吩和吡喃酮稠合噻吩的一种高效,简洁的一锅合成方法,是通过硫代乙醇酸乙酯通过分子间和分子内C–S和C–C键的形成,对适当官能化的2 H -pyran-2-ones进行碱诱导的环转化来描述的。