Show how to synthesize the following amines from the indicated starting materials by acylation–reduction.
(a) N-butylpiperidine from piperidine
(b) N-benzylaniline from aniline

검증된 단계별 안내

Step 1: Understand the acylation-reduction process. Acylation involves introducing an acyl group (RCO-) to the starting material, typically using an acid chloride or anhydride. Reduction then converts the intermediate amide into the desired amine by reducing the carbonyl group to a methylene (-CH2-) group.

Step 2: For part (a), synthesizing N-butylpiperidine from piperidine: Begin by reacting piperidine with butanoyl chloride (CH3CH2CH2COCl) in the presence of a base like pyridine. This forms an amide intermediate, N-butanoylpiperidine.

Step 3: Reduce the amide intermediate (N-butanoylpiperidine) to the desired amine (N-butylpiperidine) using a reducing agent such as lithium aluminum hydride (LiAlH4). This step removes the carbonyl group, leaving a -CH2- group in its place.

Step 4: For part (b), synthesizing N-benzylaniline from aniline: React aniline (C6H5NH2) with benzoyl chloride (C6H5COCl) in the presence of a base like pyridine. This forms an amide intermediate, N-benzoylaniline.

Step 5: Reduce the amide intermediate (N-benzoylaniline) to the desired amine (N-benzylaniline) using a reducing agent such as lithium aluminum hydride (LiAlH4). This step converts the carbonyl group into a methylene (-CH2-) group, completing the synthesis.

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Acylation

Acylation is a chemical reaction that introduces an acyl group into a molecule. In the context of amine synthesis, it typically involves the reaction of an amine with an acyl chloride or an anhydride, resulting in the formation of an N-acylated amine. This step is crucial for modifying the amine's reactivity and preparing it for subsequent reduction.

Reduction

Reduction is a chemical process that involves the gain of electrons or the decrease in oxidation state of a molecule. In the synthesis of amines, the reduction step often follows acylation and can be achieved using reducing agents like lithium aluminum hydride (LiAlH4) or catalytic hydrogenation. This step converts the acylated intermediate back to the desired amine, completing the synthesis.

Amines

Amines are organic compounds derived from ammonia by replacing one or more hydrogen atoms with alkyl or aryl groups. They are classified as primary, secondary, or tertiary based on the number of carbon-containing groups attached to the nitrogen atom. Understanding the structure and reactivity of amines is essential for predicting the outcomes of acylation and reduction reactions in synthetic pathways.

Show how to synthesize the following amines from the indicated starting materials by acylation–reduction. (a) N-butylpiperidine from piperidine (b) N-benzylaniline from aniline