Show how you would accomplish the following synthetic conversions.
(f) (R)-2-bromobutane → (S)-2-methylbutan-1-amine

검증된 단계별 안내

Step 1: Analyze the starting material (R)-2-bromobutane and the target product (S)-2-methylbutan-1-amine. Note that the stereochemistry changes from (R) to (S), and the functional group changes from a bromine atom to a primary amine (-CH2NH2).

Step 2: Perform a nucleophilic substitution reaction (SN2) using cyanide ion (CN⁻) as the nucleophile. This will replace the bromine atom with a cyano group (-CN) and invert the stereochemistry, converting (R)-2-bromobutane to (S)-2-methylbutanenitrile.

Step 3: Reduce the nitrile group (-CN) in (S)-2-methylbutanenitrile to a primary amine (-CH2NH2). This can be accomplished using a reducing agent such as lithium aluminum hydride (LiAlH4) followed by hydrolysis.

Step 4: Verify that the stereochemistry remains (S) after the reduction step, as the reduction of the nitrile group does not affect the stereocenter.

Step 5: Confirm the final product is (S)-2-methylbutan-1-amine, ensuring both the functional group transformation and stereochemical inversion are correct.

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이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.

영상 길이:

주요 개념

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

Stereochemistry

Stereochemistry is the study of the spatial arrangement of atoms in molecules and how this affects their chemical behavior. In this question, the conversion involves changing the configuration of (R)-2-bromobutane to (S)-2-methylbutan-1-amine, highlighting the importance of understanding chirality and how reactions can lead to the formation of specific stereoisomers.

Nucleophilic Substitution Reactions

Nucleophilic substitution reactions involve the replacement of a leaving group (in this case, bromine) by a nucleophile (the amine group). This type of reaction is crucial for the conversion of (R)-2-bromobutane to (S)-2-methylbutan-1-amine, as it demonstrates how nucleophiles can attack electrophilic centers in organic molecules, leading to the formation of new compounds.

Chirality and Inversion of Configuration

Chirality refers to the property of a molecule that makes it non-superimposable on its mirror image, often due to the presence of a chiral center. In this conversion, the inversion of configuration is significant as the reaction must not only replace the bromine atom but also ensure that the resulting amine has the opposite configuration, transforming (R) to (S) through a specific reaction pathway.

Show how you would accomplish the following synthetic conversions. (f) (R)-2-bromobutane → (S)-2-methylbutan-1-amine