The synthesis of indanones related to combretastatin A-4 via microwave-assisted Nazarov cyclization of chalcones
摘要:
A fast and efficient microwave-assisted synthesis of combretastatin A-4-like indationes has been developed. Microwave irradiation provides a useful alternative to traditional heating techniques to promote the TFA-catalyzed Nazarov cyclization of chalcones. (c) 2006 Elsevier Ltd. All rights reserved.
A superacid (triflic acid) promoted dual C–C bond formation via intermolecular Friedel–Crafts alkylation (Michael addition type) and intramolecular acylation for the efficient synthesis of 3-substituted indan-1-ones is presented. This method was successful in activating ethyl cinnamates towards dual aromatic electrophilic substitution. Moreover, it enabled us to synthesize novel spirotetracyclic systems