The gramine route to the Diels-Alder adducts of indolo-2,3-quinodimethanes
摘要:
Indolo-2,3-quinodimethanes were smoothly generated by thermal fragmentation of 2-substituted 3-aminomethylindoles, and engaged in Diers-Alder reactions yielding 1,2,3,4-tetrahydrocarbazoles with a large array of possible substituents at either position. An intramolecular variant of the procedure generated a tetracyclic (unnatural) indolomonoterpene with complete control of three stereocenters. (C) 1999 Elsevier Science Ltd. All rights reserved.