1035-80-9Relevant articles and documents
Regioselective annulation of unsymmetrical 1,2-phenylenebis(diaryl/diheteroarylmethanol): A facile synthesis of anthracene, tetracene, and naphtho[b]thiophene analogues
Sivasakthikumaran, Ramakrishnan,Rafiq, Settu Muhammad,Sankar, Elumalai,Clement, J. Arul,Mohanakrishnan, Arasambattu K.
, p. 7816 - 7835 (2015/12/31)
A systematic study on the regioselective cyclization of benzene- and naphthalene-based unsymmetrical diols with HBr (33 %) in acetic acid at room temperature led to the formation of annulation products. By using this method, synthesis of a wide variety of anthracene, tetracene and naphtho[b]thiophene analogues was achieved in good to excellent yields. By employing HBr (33 %) in acetic acid as a catalyst for regioselective cyclization of unsymmetrical diols was very facile and devoid of commonly encountered dihydroisobenzofuran formation. Regioselective cyclization of benzene- and naphthalene-based unsymmetrical diols with HBr (33 %) in acetic acid at room temperature led to the formation of annulated arenes and heteroarenes in good to excellent yields.
Oxidative cleavage of 1,3-disubstituted benzo[ c ]furans with activated manganese dioxide: A facile preparation of 1,2-Di(het)aroylbenzenes
Sivasakthikumaran, Ramakrishnan,Nandakumar, Meganathan,Mohanakrishnan, Arasambattu K.
supporting information, p. 1896 - 1900 (2014/08/18)
Manganese dioxide mediated oxidative cleavage of 1,3-disubstituted benzo[c]furans in dichloromethane at room temperature gave good yields of 1,2-di(het)aroylbenzenes. Georg Thieme Verlag Stuttgart. New York.
Oxidative ring opening of 1,3-diarylbenzo[c]heterocycles using m-CPBA: Preparation of 1,2-diaroylbenzenes
Nandakumar, Meganathan,Sivasakthikumaran, Ramakrishnan,Mohanakrishnan, Arasambattu K.
experimental part, p. 3647 - 3657 (2012/07/27)
An unprecedented oxidative cleavage of benzo[c]heterocycles using m-CPBA is reported. The reaction of 1,3-diaryl benzo[c]heterocycles with m-CPBA (meta-chloroperoxybenzoic acid) at room temperature for 5 min led to the formation of 1,2-diaroylbenzenes in good to excellent yields.
Synthesis of annulated arenes and heteroarenes involving lewis acid-mediated regioselective annulation of unsymmetrical 1,2-(Diaryl/ diheteroarylmethine)dipivalates
Sivasakthikumaran, Ramakrishnan,Nandakumar, Meganathan,Mohanakrishnan, Arasambattu K.
, p. 9053 - 9071,19 (2012/12/12)
A ZnBr2-mediated regioselective annulation of unsymmetrical 1,2-diarylmethinedipivalates in DCM at room temperature led to the formation of annulated arenes and heteroarenes. The annulation of the dipivalate proceeds through the intermediacy of
Copper-catalyzed benzylic C-H oxygenation under an oxygen atmosphere via N-H imines as an intramolecular directing group
Zhang, Line,Ang, Gim Yean,Chiba, Shunsuke
, p. 1622 - 1625 (2011/05/05)
Copper-catalyzed benzylic C-H oxygenation under an oxygen atmosphere was developed starting from carbonitriles and Grignard reagents via N-H imine intermediates. The present process is characterized by the following two-step sequence in a one-pot manner: (1) addition of Grignard reagents to carbonitriles to form N-H imines and (2) benzylic C-H oxygenation (C=O bond formation) triggered by 1,5-hydrogen atom transfer with transient iminyl copper species.