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2005
Pyridine derivatives
R 0380
Nickel-Catalyzed Cycloaddition of Alkynes and Isocyanates. — An efficient route
the synthesis of 2-pyridones from isocyanates and diynes is described. Both in03- 138 for
tramolecular and intermolecular reactions are catalyzed by a combination of a Ni(0)
precursor and a N-heterocyclic carbene under mild conditions. First time, a seven-membered ring is formed by cycloaddition of an isocyanate with a diyne. Application
of the present new method also allows a three component cyclization. — (DUONG,
H. A.; CROSS, M. J.; LOUIE*, J.; J. Am. Chem. Soc. 126 (2004) 37, 11438-11439;
Dep. Chem., Univ. Utah, Salt Lake City, UT 84112, USA; Eng.) — S. Adam
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