using the same methodology as for 2, after inversion of configuration at C-4 by means of a Mitsunobu reaction. Treatment of the unsaturated carbohydrates 2−4, 6−8, and 10 with a catalytic amount of Pd(OAc)2/PPh3 in DMF in the presence of Bu4NHSO4 and NEt3 afforded the annelated tricyclic compounds 11−13 and 15−18 in good yields when the anomeric substituent was the p-tert-butylphenyl group, via an intramolecular