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a(i) Ethyl chloroformate, triethylamine, sodium borohydride, 0 °C to r.t.; (ii) acetic acid:dimethylformamide (1:1), sodium nitrite, 0 to 60 °C; (iii) triphenylphosphine, carbon tetrabromide, 0 °C to r.t.; (iv) 4-methylpiperidine, triethylamine, r.t. to 60 °C; (v) toluene, reflux, 7 d.
