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2005
Ring closure reactions
O 0130
Nitrogen Fixation: Synthesis of Heterocycles Using Molecular Nitrogen as a NitroSource. — A novel Ti-catalyzed nitrogenation procedure using TiCl4 or Ti(O-iPr)4
02- 034 gen
in the presence of an excess Li and Tms-Cl is described. In this reaction, 1atm pressure
of nitrogen can be used and the formation of the catalyst system proceeds at room temperature. Using this procedure, various heterocycles, such as indoles, quinolines, pyrroles, pyrrolizidines and indolizidine derivatives are synthesized from molecular nitrogen in good to moderate yields as stoichiometric reaction based on a Ti-complex by a
one-pot procedure. Furthermore, this approach is extended for the syntheses of heterocycles using a catalytic amount of Ti-complex. — (MORI*, M.; AKASHI, M.; HORI,
M.; HORI, K.; NISHIDA, M.; SATO, Y.; Bull. Chem. Soc. Jpn. 77 (2004) 9,
1655-1670; Grad. Sch. Pharm. Sci., Hokkaido Univ., Sapporo 060, Japan; Eng.) —
M. Paetzel
2005
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