A wide range of cyclohexadienones has been synthesised in order to study their reactivity and their regio- and stereoselectivity with the enantiopure diene 1 under high-pressure conditions. Computational investigations were used to point out some parameters which affect the reactivity in this high chiral discrimination process. In addition, the resulting [4+2] cycloadducts allowed the preparation of new polyfunctional cyclohexenone derivatives.
Stereoselective Synthesis of Heterocyclic Cage Compounds by Domino Conjugate Additions
作者:M. Carmen Carreño,、Carmen García Luzón、María Ribagorda
Heterocyclic cage compounds have been stereoselectively synthesized from enantiopure [(S)R]-[(p-tolylsulfinyl)methyl]-p-quinols or their amine analogues and 2-(trimethylsilyloxy)furan in the presence of Bu4NF. The method is particularly valuable not only because of the stereochemical control but also because the reactions occur in an experimentally simple one-pot procedure through a domino sequence of three consecutive conjugate additions. The intermediate 1.4-adducts could be isolated when the reaction was carried out in the presence of BF3 (.) OEt2.
Reductive and Nonreductive Aromatization of Quinol Ketal Glycals. Models for the Preparation of C-Aryl Glycoside Natural Products