par Larnaud, Florent;Sulpizi, Adamo;Häggman, Nicklas O;Hughes, Jonathan M. E.;Dewez, Damien ;Gleason, James L.
Référence European Journal of Organic Chemistry, page (2637-2640)
Publication Publié, 2017-05-12
Référence European Journal of Organic Chemistry, page (2637-2640)
Publication Publié, 2017-05-12
Article révisé par les pairs
Résumé : | The conjugate addition of indoles to α‐substituted enals is achieved by using a diazepane carboxylate catalyst under mild conditions (20 mol‐% catalyst, 20 mol‐% TFA, acetonitrile, –20 °C). The low basicity and high nucleophilicity of this catalyst overcomes the limitations of allylic 1,3 strain in the intermediate iminium ions, which is normally observed with secondary‐amine catalysts. Conjugate addition of a series of substituted indoles as well as electron‐rich aromatics with a variety of α‐substituted enals is demonstrated. |