113975-38-5Relevant academic research and scientific papers
Asymmetric Hydrogenation of Azaindoles: Chemo- and Enantioselective Reduction of Fused Aromatic Ring Systems Consisting of Two Heteroarenes
Makida, Yusuke,Saita, Masahiro,Kuramoto, Takahiro,Ishizuka, Kentaro,Kuwano, Ryoichi
supporting information, p. 11859 - 11862 (2016/11/16)
High enantioselectivity was achieved for the hydrogenation of azaindoles by using the chiral catalyst, which was prepared from [Ru(η3-methallyl)2(cod)] and a trans-chelating bis(phosphine) ligand (PhTRAP). The dearomative reaction exclusively occurred on the five-membered ring, thus giving the corresponding azaindolines with up to 97:3 enantiomer ratio.
Flash vacuum thermolysis of N-(3-and 4-Pyridylmethylidene)-tert- butylamines: Mechanisms of formation of pyrrolopyridines and naphthyridines
Justyna, Katarzyna,Lesniak, Stanislaw,Nazarski, Ryszard B.,Rachwalski, Michal,Vu, Thien Y.,Huynh, Thi Kieu Xuan,Khayar, Said,Dargelos, Alain,Chrostowska, Anna,Wentrup, Curt
supporting information, p. 3020 - 3027 (2014/05/20)
Pyrrolopyridines and naphthyridines are formed by flash vacuum thermolysis (FVT) of 3-and 4-pyridylmethylidene-tert-butylimines 8 and 15. Elimination of a methyl radical generates resonance stablized 2-azaallyl radicals a1 and b1. The formation of pyrrolopyridines 9, 16 and 17 is rationalized in terms of cyclization of 1-aziridinyl radicals a2 and b2. Formation of naphthyridine 10 from imine 8, and of 11 and 18 from imine 15, are in accord with cyclization of 1-azaallyl radicals a6 and b9. Formation of naphthyridine 11 from 8, and of 10 and 19 from 15, indicate the operation of the spiro-cyclization pathways forming intermediates a9 and b14. Formation of the 1,8-naphthyridine 20 (3%) indicates a rearrangement through aziridine b22 and biradical b23. DFT calculations at the CAM-B3LYP/6-311G(d,p) level support the proposed reaction mechanisms.
Synthesis of aromatic ring fused pyrrole derivatives by palladium-catalyzed annulation of o-iodoarylamines with allyl acetate
Hong, Chang Sung,Seo, Jae Yong,Yum, Eul Kgun,Sung, Nack-Do
, p. 631 - 639 (2007/10/03)
Indoles, azaindoles, and pyrroloquinolines were obtained by palladium-catalyzed annulation of o-iodoarylamines with allyl acetate under 5 mol percent Pd(OAc)2, 1 equiv. LiCl, 3 equiv. K2CO3, and 2 equiv. allyl acetate in DMF at 120°C.
Metalation/SRN1 Coupling in Heterocyclic Synthesis. A Convenient Methodology for Ring Functionalization
Estel, L.,Marsais, F.,Queguiner, G.
, p. 2740 - 2744 (2007/10/02)
Lithiation, iodination, and fluorine substitution on 2-fluoropyridine gave 2-substituted 3-iodopyridines, which were further subjected to iodine SRN1 substitution by carbon, sulfur, and phosphorus nucleophiles.Iodine substitution by enolates on 2-amino-3-iodopyridines afforded ketones, which were further cyclized to various 1,2-disubstituted pyrrolopyridines. 2-Amino-3-iodo-, 3-amino-4-iodo, and 4-amino-3-iodopyridines were prepared by directed metalation of 2-, 3-, and 4-(pivaloylamino)pyridines.Substitution of iodine by enolates under SRN1 conditions and acidic cyclization led to various 2-substituted pyrrolo, --, and -pyridines in high yields.
