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2005
Pyrazole derivatives
R 0180
Efficient Synthesis of 3-Substituted Indazoles Using Pd-Catalyzed Intramolecular
Reaction of N-Tosylhydrazones. — The title reaction exhibits good func03- 124 Amination
tional group-compatibility under mild reaction conditions. Base-sensitive substituents
such as ester and amide remain intact during the cyclization. In addition, it is confirmed
that the detosylation can be achieved effectively to obtain the deprotected indazoles,
such as (V) and (VI). — (INAMOTO, K.; KATSUNO, M.; YOSHINO, T.; SUZUKI,
I.; HIROYA, K.; SAKAMOTO*, T.; Chem. Lett. 33 (2004) 8, 1026-1027; Grad. Sch.
Pharm. Sci., Tohoku Univ., Aoba, Sendai 980, Japan; Eng.) — M. Paetzel
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