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Stereoselective Ring Opening of Bicyclic Nitroso Diels-Alder Cycloadducts with Carbon Nucleophiles

[ Vol. 9 , Issue. 4 ]

Author(s):

Stefano Crotti and Mauro Pineschi   Pages 460 - 469 ( 10 )

Abstract:


Bicyclic oxazines are attractive compounds and valuable synthetic intermediates as they can be easily obtained by hetero Diels-Alder reactions between cyclic dienes and nitroso dienophiles. In particular, the more strained case (i.e. the [2.2.1]-cycloadduct) represents an interesting powerful combination of stability and reactivity as it can be transformed into highly densely functionalized cyclopentene derivatives by a variety of ring-opening reactions. Aim of this article is to summarize the methods used by various chemists for opening of bicyclic oxazines by the formation of a new carbon-carbon bond, to give highly substituted ring systems containing multiple stereocenters. Particular emphasis will be given to regio- and stereoselective procedures, including the most recent developments on less strained [2.2.2]-cycloadduct.

Keywords:

Bicyclic oxazines, hetero Diels-Alder cycloadducts, acylnitroso cycloadducts, metal catalyzed ring opening, copper, rhodium, Grignard reagents, organoboronic derivatives, stereoselective synthesis, allylation, cross metathesis.

Affiliation:

Dipartimento di Scienze Farmaceutiche, Sede di Chimica Bioorganica e Biofarmacia, Universita di Pisa, Via Bonanno 33, 56126 Pisa, Italy.



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