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aReaction conditions were as follows: (i) diethyl succinate, EtONa, EtOH, 70°C; (ii) 10% Pd/C, H2, MeOH, rt; (iii) KOH, CaCl2, EtOH, 0°C; (iv) NaBH4, rt; (v) 3 M HCl, rt; (vi) LDA, 3,4,5-trimethoxybenzaldehyde, THF, −78°C, (vii) MsCl, TEA, CH2Cl2, 0°C; (viii) DBU, CH3CN, rt; (ix) Ac2O, TEA, DMAP, CH2Cl2, rt; (x) DBU, PhCH3, 80°C.
