Scheme 2 Reagents and conditions: (i) NaNO2, HCl, −10°C, CH3COONa, NaNO2, NaN3, (ii) SOCl2, toluene reflux, (iii) L-proline, TEA, RT, (iv) SOCl2, Toluene, tert-Butyl acetoacetate, MgCl2, DCM, Hunig's base, (v) Toluene, p-TSA 80°C, (vi) PPh3, DCM, 0°C.
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