I want to know the mechanism or some explanation as to how the last step here (with hydroxylamine) works:
closed as off-topic by paracetamol, Todd Minehardt, Nilay Ghosh, airhuff, ron Nov 24 '17 at 22:31
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The hydroxylamine attacks the methyl ester through nitrogen giving the intermediate hydroxamic acid. The oxygen to the hydroxamic acid then attacks the chloromethyl to displace chlorine giving cycloserine.