Sodium Iodide → 4-O-tert-butyl 1-O-[(4-methoxyphenyl)methyl] (2S)-2-[(Z)-[2-[[(5R,6R,7R)-3-(iodomethyl)-2-[(4-methoxyphenyl)methoxycarbonyl]-5,8-dioxo-5lambda4-thia-1-azabicyclo[4.2.0]oct-2-en-7-yl]amino]-1-[2-[(2-methylpropan-2-yl)oxycarbonylamino]-1,3-thiazol-4-yl]-2-oxoethylidene]amino]oxybutanedioate

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To the solution of (S)-4-tert-butyl 1-(4-methoxybenzyl) 2-(((Z)-(1-(2-((tert-butoxycarbonyl)amino)thiazol-4-yl)-2-(((5R,6R,7R)-3-(chloromethyl)-2-(((4-methoxybenzyl)oxy)carbonyl)-5-oxido-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-en-7-yl)amino)-2-oxoethylidene)amino)oxy)succinate (1.183 g, 1.25 mmol) in acetone (50 mL) at room temperature was added sodium iodide (0.234 g, 1.563 mmol). The mixture stirred at room temperature for 2 hours. Filtered and evaporated to give (S)-4-tert-butyl 1-(4-methoxybenzyl) 2-(((Z)-(1-(2-((tert-butoxycarbonyl)amino)thiazol-4-yl)-2-(((5R,6R,7R)-3-(iodomethyl)-2-(((4-methoxybenzyl)oxy)carbonyl)-5-oxido-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-en-7-yl)amino)-2-oxoethylidene)amino)oxy)succinate (1.1 g, 1.060 mmol, 85% yield). LCMS (M+H)+: 1038.9

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