title: Tandem synthesis of pyrroloacridones via [3 + 2] alkyne annulation/ring-opening with concomitant intramolecular aldol condensation.
abstract: An efficient cascade strategy for the direct synthesis of pyrrolo[3,2,1-de]acridones 4a-v, 5a-h from iodo-pyranoquinolines 2a-i by the palladium-catalyzed regioselective [3 + 2] alkyne annulation/ring-opening followed by intramolecular aldol condensation under microwave irradiation is described. The chemistry involves the in situ formation of pyrroloquinolines Y, via palladium-catalyzed selective [3 + 2] annulation of iodopyranoquinolines and internal akynes with ring-opening and successive intramolecular cross-aldol condensation. Both the symmetrical and unsymmetrical internal alkynes were reacted smoothly to provide the desired pyrroloacridones in good yields. This methodology provides the facile conversion of easily accessble iodopyranoquinoline into highly functionalized biologically important pyrroloacridones in a single process.
authors: Synthetic Organic Chemistry Laboratory, Department of Chemistry, University of Delhi, Delhi, 110007, India.
authors: Akhilesh K
authors: AK
authors: Verma
authors: Siva K Reddy
authors: SK
authors: Kotla
authors: Trapti
authors: T
authors: Aggarwal
authors: Sonu
authors: S
authors: Kumar
authors: Hemlata
authors: H
authors: Nimesh
authors: Rakesh K
authors: RK
authors: Tiwari
mesh_terms: D000166:Acridines / Q000138:chemical synthesis* / Q000737:chemistry; D000447:Aldehydes / Q000737:chemistry*; D000480:Alkynes / Q000737:chemistry*; D003500:Cyclization; D008872:Microwaves; D015394:Molecular Structure; D011758:Pyrroles / Q000138:chemical synthesis* / Q000737:chemistry
chemical_list: D000166:Acridines; D000447:Aldehydes; D000480:Alkynes; D011758:Pyrroles