Scheme 3.
Synthesis of imidate 7. Reagents and conditions: (a) CH3I, NaH, DMF, RT, 2 h, 100% (crude); (b) Ac2O-TFA, RT, 16 h, 100% (crude); (c) BnNH2, THF, RT, 3 h, 100% (crude); (d) Cl3CCN, CH2Cl2, Cs2CO3, RT, 3 h, 60% (4 steps).
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