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. Author manuscript; available in PMC: 2018 Oct 25.
Published in final edited form as: J Med Chem. 2010 May 13;53(9):3489–3501. doi: 10.1021/jm901691y

Scheme 1a:

Scheme 1a:

a Reaction conditions: (a) (i) POCI3, (CH3O)3 PO;(ii) NH4HCO3; b) (i) n-Bu3N, DMF; (ii) CDI, DMF;(iii) CH3OH,DMF;(iv) (n-Bu3NH)2(P2O7H2), DMF; (v) NH4HCO3; (c) (i) n-Bu3N, DMF; (ii) CDI, DMF; (iii) CH3OH, DMF; (iv) (n-Bu3NH)(HPO4), DMF; (v) NH4HCO3.