Helvetica Chimica Acta p. 109 - 123 (1992)
Update date:2022-07-30
Topics:
Defoin, Albert
Brouillard-Poichet, Agnes
Streith, Jacques
Chiral acylnitroso dienophiles 14, which were obtained from L-proline and from D-mandelic acid, reacted with cyclohexa-1,3-diene to give the expected diastereoisomers 15 and 16 (Scheme 2 and Table 1).The d.e. values for these Diels-Alder reactions were moderate; they are related to the molecular stiffness of the dienophiles.The absolute configuration of the major cycloadducts was interpreted in terms of HOMO/LUMO interactions, the approach being 'endo' and the acylnitroso dienophiles reacting from their s-cis-conformation.
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