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2005
Pyrazole derivatives
R 0180
Experimental and Theoretical Investigation of the Coarctate Cyclization of
— A novel and selective route to biologically
08- 120 (2-Ethynylphenyl)phenyldiazenes.
interesting 2-arylindazoles is developed. It proceeds via free carbene intermediates as
confirmed by isolation of the cyclopropyl derivative (VIII) in the presence of the carbene trap (VII). Under these mild conditions, a number of functional groups are tolerated and no 6-membered ring formation takes place. — (SHIRTCLIFF, L. D.;
WEAKLEY, T. J. R.; HALEY*, M. M.; KOEHLER, F.; HERGES, R.; J. Org. Chem.
69 (2004) 21, 6979-6985; Dep. Chem., Univ. Oreg., Eugene, OR 97403, USA; Eng.)
— Jannicke
2005
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