title: Multi-catalysis reactions: direct organocatalytic sequential one-pot synthesis of highly functionalized cyclopenta[b]chromen-1-ones.
abstract: We have developed a new technology called multi-catalysis for the sequential one-pot synthesis of highly functionalized heterocycles. A practical and novel multi-component aniline-, self- and Brønsted acid-catalyzed selective process for the sequential one-pot synthesis of highly substituted 2-(2-hydroxy-aryl)-cyclopentane-1,3-diones, 3,9-dihydro-2H-cyclopenta[b]chromen-1-ones and 3,3-dimethyl-2,3,4,9-tetrahydro-xanthen-1-ones is reported. Direct combination of aniline- and self-catalyzed cascade olefination-hydrogenation (O-H) and Brønsted acid-catalyzed cascade oxy-Michael-dehydration (OM-DH) of 1,3-diones, salicylic aldehydes and organic-hydrides is developed in one-pot to furnish the highly functionalized 3,9-dihydro-2H-cyclopenta[b]chromen-1-ones and 3,3-dimethyl-2,3,4,9-tetrahydro-xanthen-1-ones with high yields.
authors.affiliation: School of Chemistry, University of Hyderabad, Hyderabad-500 046, India. ramsc@uohyd.ernet.in
authors.forename: Dhevalapally B
authors.initials: DB
authors.lastname: Ramachary
authors.forename: Y Vijayendar
authors.initials: YV
authors.lastname: Reddy
authors.forename: Mamillapalli
authors.initials: M
authors.lastname: Kishor
mesh_terms: D000447:Aldehydes / Q000737:chemistry; D000478:Alkylation; D002384:Catalysis; D003374:Coumarins / Q000138:chemical synthesis* / Q000737:chemistry; D004952:Esters / Q000737:chemistry; D010084:Oxidation-Reduction
chemical_list: D000447:Aldehydes; D003374:Coumarins; D004952:Esters; C030123:coumarin