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2005
Benzofuran derivatives
R 0070
Direct Oxidative Heck Cyclizations: Intramolecular Fujiwara—Moritani Arylafor the Synthesis of Functionalized Benzofurans and Dihydrobenzofurans.
09- 095 tions
— Intramolecular oxidative cyclization of allyloxyarenes [cf. (I)] is smoothly achieved
under Pd(II) catalysis to afford highly substituted benzofurans (II), (IV) in moderate to
good yields. The reaction is currently limited to electron-rich arenes. The application
of allyloxyarenes with tri- or tetra-substituted double bonds provides access to dihydrobenzofurans (VI) and (VIII) containing a quaternary carbon center. The reaction
mechanism is discussed. — (ZHANG, H.; FERREIRA, E. M.; STOLTZ*, B. M.;
Angew. Chem., Int. Ed. 43 (2004) 45, 6144-6148; Arnold and Mabel Beckman Lab.
Chem. Synth., Calif. Inst. Technol., Pasadena, CA 91125, USA; Eng.) — Mischke
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