Current Organic Chemistry - Volume 18, Issue 21, 2014

The possibilities for the synthesis of phosphinic esters (phosphinates) and phosphinic amides, useful starting materials and intermediates, are discussed. The classical method involves the use of phosphinic chlorides in reaction with the alcohol/ phenol or amine as the nucleophile. A “greener” approach may start from phosphinic acids, however, their direct esterification and amidation are not possible on conventiona Read More

The interest in the chemistry of saturated oxazolones continues unabated in virtue of their usefulness as intermediates in the synthesis of highly substituted heterocycles. This review attempts to present the prolific development of recent years in this area and gives a critical and unified account of azlactones under the following headings: saturated oxazolone synthesis; generation of cyclic azomethine ylide intermediates Read More

The guanidine functional group is an important structural motif in synthesis with a wide range of interesting properties. Guanidines are frequently found in bioactive compounds; both from natural sources or from synthetic origin, these compounds are considered fundamental entities in medicinal chemistry. The relevance of these compounds fosters the efforts to explore new methodologies for the synthesis of substance Read More

Chalcones belong to the flavonoid family which constitutes one of the major classes of naturally occurring oxygen heterocyclic compounds. The α,β-unsaturated carbonyl system of chalcones possesses two electrophilic reactive centers allowing them to participate in addition reactions via attack to the carbonyl group (1,2-addition) or involving the β-carbon (1,4-conjugate addition), leading to the synthesis of promising bioac Read More

Cyclometalation reactions are usually defined as the reactions of metal compounds with conventional substrates, such as benzylamines and 2-phenylpyridines. In contrast, unconventional cyclometalation reactions are the reactions of metal compounds with unconventional base substrates, such as 2-amino-3-picoline, anilines and 2- aminopyridines, and with auxiliary substrates, such as aldehydes and alkynes. Other unconve Read More