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Reagents and conditions: (i) appropriate phosphorochloridate, tBuMgCl, anhydrous pyridine, rt overnight; (ii) MMT-Cl, TEA, DMAP, anhydrous DMF, rt, 2 h; (iii) appropriate phosphorochloridate, tBuMgCl, anhydrous THF, rt, overnight; (iv) DCM/MeOH, PTSA, rt, 2 h.
