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Reagents and conditions: (a) TsNHNH2 (1.0 eq), TsOH·H2O (10 mol%), EtOH, 60 °C, 2 h, 61%. (b) BnMgBr (1.0 eq), tetrahydrofuran (THF), 22 °C, 15 min, 32% for 14 and 40% for 15. ORTEP, Oak Ridge Thermal Ellipsoid Plot.
