5624 J. Org. Chem. 1987, 52, 5624-5627 tosylhydrazine (1.73 g, 0.0093 mol) in methanol (8 mL) at room temperature for 2 h was concentrated, chromatographed on silica gel with 1: l chloroform/hexane as the developer, and then recrystallized from methylene chloride/hexane to yield 6a (2.21 g, 80%) as light yellow crystals: mp 114-116" C;'H NMR (DMSO-d,) 6 8.42 (s, 1 H, H at C-9), 7.13-7.94 (m, 5 H, aromatic Hand NH), 6.10-5.64 (m, 7 ...
