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Haley and co-workers reported thermal cyclization of 2- ethynylphenyltriazenes; see: (e) Kimball., D. B.; Hayes, A. G.; Haley, M. M. Org. Lett. 2000, 2, 3825-3827.
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For recent application of indole synthesis from N-arylhydrazone prepared from α-diazoesters, see: (d) Yasui, E.; Wada, M.; Takamura, N. Tetrahedron Lett. 2006, 47, 743-746.
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Sakamoto reported that both E- and Z-isomer hydrazones successfully cyclized to give indazole via intramolecular N-arylation under Pd catalysis; see: Inamoto, K.; Katsuno, M.; Yoshino, T.; Suzuki, I.; Hiroya, K.; Sakamoto, T. Chem. Lett. 2004, 33, 1026-1027. Our result using the Z-isomer is described in Supporting Information.
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Sakamoto reported that both E- and Z-isomer hydrazones successfully cyclized to give indazole via intramolecular N-arylation under Pd catalysis; see: Inamoto, K.; Katsuno, M.; Yoshino, T.; Suzuki, I.; Hiroya, K.; Sakamoto, T. Chem. Lett. 2004, 33, 1026-1027. Our result using the Z-isomer is described in Supporting Information.
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The stereochemistry of 17a,b was determined by conversion to tert-butyl 2-(N-benzoylhydrazino)-3-phenyl-3-(tert-butyldimethylsilyloxy)propionate by dehalogenation s-BuLi/THF, 78°C, 1 h, see ref 8b
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The stereochemistry of 17a,b was determined by conversion to tert-butyl 2-(N-benzoylhydrazino)-3-phenyl-3-(tert-butyldimethylsilyloxy)propionate by dehalogenation (s-BuLi/THF,- 78°C, 1 h); see ref 8b.
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