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tert-butyl 3-amino-3-(cyanomethyl)azetidine-1-carboxylate
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tert-butyl 3-(hydroxymethyl)azetidine-1-carboxylate
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tert-butyl 3-(fluoromethyl)azetidine-1-carboxylate
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tert-butyl 3-(cyanomethylene)azetidine-1-carboxylate
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tert-butyl 3-(bromomethyl)-3-fluoroazetidine-1-carboxylate
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tert-butyl 3-((methylsulfonyl)oxy)azetidine-1-carboxylate