Scheme 3.
Alternate triflic anhydride mediated synthesis of mixed phosphonate esters. Reagents and conditions: (a) Tf2O, pyr, rt; (b) 2-nitro-1-naphthol, rt, 95% in two steps; (c) POMCl, NaI, reflux, 30%; (d) SeO2, tBuOOH, 15%.
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