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Reagents and conditions: (i) (iPr)2N–P(OBn)2, 5-Ph-1H-tetrazole, DCM then mCPBA, 86%; (ii) cyclohexene, MeOH–H2O, Pd(OH)2/C, 80 °C, 2 h; (iii) AMP-morpholidate, MgSO4, MnCl2 in formamide (0.2M), rt, 16 h, 14%.
