Solid-Supported Heterocumulenes: Preparation and Crystal Structure of Azaaplysinopsins
作者:Jean M. Chezal、Grégory Delmas、Sylvie Mavel、Hamed Elakmaoui、Jacques Métin、Anna Diez、Yves Blache、Alain Gueiffier、Mario Rubiralta、Jean C. Teulade、Olivier Chavignon
DOI:10.1021/jo962174y
日期:1997.6.13
Annulation of carbodiimides 6a,b, on alumina solid support, selectively gives (Z)-hydantoins 8a,b determined on the basis of X-ray analysis while thermal cyclization affords, after purification, 8a,b with imidazolones 10a,b. In the imidazopyrimidine series, thermal reaction of heterocumulenes 6d yields, via a Dimroth rearrangement, the dipyridoimidazolic compound 11. In all cases, mechanisms for the observed cyclizations have been proposed.