Scheme 7.
Reagents and conditions: (i) (Me)2SO4, Na, EtOH, rt, 4 h; (ii) HC(O)H 37%, MeOH, H2SO4 96%, reflux, 2 h; (iii) HC(O)H 37%, MeOH, H2SO4 96%, reflux, 1 h; (iv) AcOH, PtO2, H2, 60 °C, 4 h.
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