reaction of aldehydes 3a–e with nitroalkanes and NH4OAc at reflux, reduction of the resulting nitroalkenes 4a–h with LAH at rt followed by protection with K2CO3 and PhSO2Cl at rt, one-pot oxidative cleavage annulation of olefins 5a–h with the one-pot combination of OsO4/NaIO4 at reflux, and hydrogenation of the corresponding enamines 6a–f. Aldehydes 3a–e was prepared from 2a and 2b in moderate yield of