Abstract
Publisher Summary This chapter reviews the cycloadditions reactions because they are popular, widely used, and also constitutes enormous body of chemistry. The chapter focuses on the landmark achievements as well as state-of-the-art examples of relevant chemistry. Particular attention is made to examples in which the synthetic utility of the system is explored. The Diels-Alder reactions in successful synthesis of natural and non-natural products are also reviewed. The Boron Lewis acids are presented with illustrations. These are acidic boron complexes derived from modified tartarate esters. The aluminum, copper, titanium, and other metal based catalysts are also discussed. A number of other chiral Lewis acids is applied to related processes all featuring the combination of nitrones on electron poor bidentate alkene.
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