Direct Synthesis of Substituted Pyrimidines and Quinazolines
作者:Mohammad Movassaghi、Matthew Hill
DOI:10.1055/s-2007-990932
日期:2008.3
A variety of N-vinyl and N-aryl amides were converted in one step into the corresponding pyrimidine and quinazoline derivatives, respectively. Amide activation with trifluoromethanesulfonic anhydride in the presence of 2-chloropyridine followed by nitrile addition to the activated amide derivative and annulation provides the desired azaheterocycles.
We describe a single-step conversion of various N-vinyl and N-aryl amides to the corresponding pyrimidine and quinazoline derivatives, respectively. The process involves amide activation with 2-chloropyridine and trifluoromethanesulfonic anhydride followed by nitrile addition into the reactive intermediate and cycloisomerization. In situ nitrile generation from primary amides allows for their use as nitrile surrogates. The use of this chemistry with sensitive N-vinyl amides and epimerizable substrates in addition to a wide range of functional groups is noteworthy.
New Strategies for the Synthesis of Pyrimidine Derivatives
作者:Matthew D. Hill、Mohammad Movassaghi
DOI:10.1002/chem.200800014
日期:2008.8.8
Recent advances in pyrimidinesynthesis are described. Modification of conventional strategies involving N-C-N fragment condensation with 1,3-dicarbonyl derivatives remains a common theme in current literature. Other methods, including N-C fragment condensation strategies, provide reactive intermediates capable of intramolecular cyclization and formation of pyrimidinederivatives. These recently developed