Journal of the Japan Society of Colour Material
Online ISSN : 1883-2199
Print ISSN : 0010-180X
ISSN-L : 0010-180X
Synthesis of 2-Aryl-2H-indazoles by TiO2-Photocatalyzed Reaction of Alkoxyazobenzenes
Masaki MATSUIKatsuyoshi SHIBATA
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2002 Volume 75 Issue 2 Pages 61-65

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Abstract

3-Substituted 5-alkoxy-2-aryl-2H-indazoles were synthesized in low to moderate yields by the TiO2-photocatalyzed reaction (λ>280 nm) of 4-alkoxyazobenzenes in alcohols. The formation of hydroxyalkyl radicals and the presence of an electron-donating alkoxy group in the starting azobenzenes are very important in this reaction. This is an unique method for the synthesis of 3-substituted 5-alkoxy-2-aryl-2H-indazoles from 4-alkoxyazobenzenes.

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