title: Base catalysed synthesis of thiochromans and azo-linked chromenes using allenylphosphonates.
abstract: An efficient base catalysed approach to the synthesis of thiochromans/chromenes from allenylphosphonates (and an allenoate) and substrates having SH/OH and CHO groups at appropriate positions has been developed. Several azo-linked chromenes that are bright red pigments are also synthesized. This methodology involves the domino reactions of Michael addition and subsequent cyclisation by intramolecular aldol reaction.
authors.affiliation: School of Chemistry, University of Hyderabad, Hyderabad 500 046, A. P., India.
authors.forename: M
authors.initials: M
authors.lastname: Phani Pavan
authors.forename: M
authors.initials: M
authors.lastname: Nagarjuna Reddy
authors.forename: N N
authors.initials: NN
authors.lastname: Bhuvan Kumar
authors.forename: K C
authors.initials: KC
authors.lastname: Kumara Swamy
mesh_terms: D000466:Alkadienes / Q000737:chemistry*; D001391:Azo Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D002384:Catalysis; D002839:Chromans / Q000138:chemical synthesis* / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D015394:Molecular Structure; D010755:Organophosphates / Q000737:chemistry*; D013438:Sulfhydryl Compounds / Q000138:chemical synthesis* / Q000737:chemistry
chemical_list: D000466:Alkadienes; D001391:Azo Compounds; D002839:Chromans; D010755:Organophosphates; D013438:Sulfhydryl Compounds