Synthesis of 3-substituted indazoles and benzoisoxazoles via Pd-catalyzed cyclization reactions: application to the synthesis of nigellicine

…, M Katsuno, T Yoshino, Y Arai, K Hiroya, T Sakamoto

Index: Inamoto, Kiyofumi; Katsuno, Mika; Yoshino, Takashi; Arai, Yukari; Hiroya, Kou; Sakamoto, Takao Tetrahedron, 2007 , vol. 63, # 12 p. 2695 - 2711

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Citation Number: 74

Abstract

Syntheses of 3-substituted indazoles and benzoisoxazoles were efficiently accomplished with the aid of Pd-catalyzed intramolecular carbon–nitrogen and carbon–oxygen bond formations. The catalyst system described herein allows the cyclization to proceed under very mild conditions and thus could be applied to a wide range of substrates with acid-or base-sensitive functional groups. A total synthesis for the indazole ring-containing natural ...