Question

Show how you would accomplish the following syntheses in good yields.(g)

Accepted Answer

Step 1: Analyze the starting material and the product. The starting material is a cyclic ketone with two ester groups (-COOCH₃) attached to the alpha-carbon. The product has the same cyclic ketone structure, but the ester groups have been converted into beta-keto esters (-CH₂COCH₃). This suggests a transformation involving enolate chemistry. Step 2: Recognize that the transformation likely involves a Claisen condensation. In this reaction, an ester reacts with a base to form an enolate, which then undergoes nucleophilic attack on another ester molecule, forming a beta-keto ester. Step 3: Choose an appropriate base for the reaction. A strong base such as sodium ethoxide (NaOEt) or sodium methoxide (NaOMe) is commonly used for Claisen condensations. The base will deprotonate the alpha-hydrogen of the ester group, forming the enolate intermediate. Step 4: Ensure the reaction conditions are suitable for Claisen condensation. The reaction should be carried out in an alcohol solvent (e.g., ethanol or methanol) that matches the alkoxide base used. After the reaction, an acid workup (e.g., H₃O⁺) is typically performed to neutralize the base and isolate the product. Step 5: Verify the product structure. The Claisen condensation will result in the formation of the desired beta-keto ester groups (-CH₂COCH₃) on the alpha-carbon of the cyclic ketone. This matches the target product shown in the problem.

Show how you would accomplish the following syntheses in good yields.
(g)

비슷한 문제에 대한 검증된 영상 답변:

주요 개념

Synthetic Pathways

Reaction Mechanisms

Yield Optimization