78685-68-4Relevant academic research and scientific papers
Base-Free and Catalyst-Free Synthesis of Functionalized Dihydrobenzoxazoles via Vinylogous Carbonate to Carbamate Rearrangement
Das, Tamal Kanti,Mondal, Santigopal,Gonnade, Rajesh G.,Biju, Akkattu T.
supporting information, p. 5597 - 5600 (2017/10/25)
An unexpected, catalyst-free, and base-free intramolecular cyclization of N-aryloxyacrylate aldimines, under thermal conditions leading to the synthesis of functionalized dihydrobenzoxazoles, is reported. The reaction features a unique rearrangement of vi
A novel dinuclear chiral niobium complex for Lewis acid catalyzed enantioselective reactions: Design of a tridentate ligand and elucidation of the catalyst structure
Kobayashi, Shu,Arai, Kenzo,Shimizu, Haruka,Ihori, Yoichi,Ishitani, Haruro,Yamashita, Yasuhiro
, p. 761 - 764 (2007/10/03)
Two's company: By using a novel chiral ligand a dinuclear chiral niobium catalyst for highly enantioselective Mannich-type reactions was developed. Tridentate binol derivatives provide excellent asymmetric environments around the niobium atom, and the Man
Photochemical and Thermal Reactions of Aromatic Schiff Bases
Tauer, Erich,Grellmann, Karl H.
, p. 4252 - 4258 (2007/10/02)
The photochemical and thermal reactions of aromatic Schiff bases (SB) prepared from o-aminophenol and aldehydes and from o-aminophenol and ketones are compared.All SB's are converted by light into the corresponding benzoxazolines.For the SB's derived from aldehydes, benzoxazoline formation is a prerequisite to convert them by a second photon into benzoxazoles.In some cases oxygen is not required for this second reaction step.SB's derived from ketones are converted into benzoxazoles by the absorption of just one photon, but only in the presence of oxygen and only if the aliphatic residue R1 of the N=C(R1R2) bridge contains at least two carbon atoms.A radical mechanism is proposed for this reaction.Benzoxazine formation is observed in some cases as a thermal side reaction.The photochemical reactions of the latter were also investigated.
