“…Compound was prepared from 1b (Method A1, Table 2), 2b, and 2e (Method B, Table 1). Colorless crystals, mp 71−72°C (hexane); For 4b, mp 72−73°C (ethanol) was referred [1]; For NMR see Table 3; EI-MS (m/z, %): 289 (14), 288 (5), 287 (22), 254 (6), 253 (6), 252 (19), 251 (9), 250 (7), 217 (25), 216 (100), 215 (9), 214 (13), 189 (8), 126 (13), 125 (6), 113 (6), 108 (27), 95 (15), 94 (6), 89 (6), 63 (11), 51 (11). Anal.…”