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Reagents and conditions: (a) Nucleophile, MeOH. (b) Pd/C 10% H2, DCM. (c) DPPA, TEA, t-butanol. (d) TFA, DCM. (e) (CO)2Cl2, DCM, DMF (cat) 0° to room temperature. (f) DIEA, DCM, room temperature.
