Scheme 14.
Synthetic scheme for preparation of 64. Reaction conditions: (a) sodium ascorbate, CuSO4·5H2O; (b) (COCl)2, DMSO, TEA; (c) CH3COC(=N)2PO(OCH3)2 (Ohira-Bestmann reagent), K2CO3, MeOH; (d) Pd(PPh3)4, TEA, DMF.
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