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(i) p-nitrobenzyl chloroformate, sodium carbonate (aq), EtOAc, 55% yield. (ii) p-nitrobenzyl chloride, TEA, DCM, 47% yield. (iii) propargyl bromide, potassium carbonate, MeCN, 83% yield. (iv) propargyl chloroformate, TEA, DMAP, DCM, 54% yield.
