3. Using curved arrows, draw the mechanism of both steps involved in the synthesis of isoxazole (5). Why is a base (triethyl amine) required in the first step of the pathway? What is the byproduct (4) of this step? NH2 CI. -NH H3C- -Ph H3C- -CH3 + 1 2 3 4 Robinson H3PO4 Gabriel -N + H20 H3C- -CH3 5

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