Intramolecular acid-catalyzed aldolization of oxindolic methylketones
摘要:
The oxindolic methylketones 13, 15, 20 and 22 were cyclized in one step with para-toluene-sulfonic acid to the tetracyclic enaminoketones 16, 17, 23 and 24, respectively. (C) 1997 Elsevier Science Ltd.