Scheme 1.
Reagents and conditions: (i) MePPh3Br, tBuOK, THF, RT, 18 h, 65%; (ii) Net3, CH2Cl2, 0 °C to RT, 4 h, 57%; (iii) 5, toluene, 70 °C, 4 h, 96%; (iv) Fe, AcOH, EtOH, H2O, 75 °C, 1 h, 98%; (v) RCOCl, Net3, CH2Cl2, 0 °C to RT, 4 h.
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