EBK ORGANIC CHEMISTRY
EBK ORGANIC CHEMISTRY
8th Edition
ISBN: 8220102744127
Author: Bruice
Publisher: PEARSON
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Chapter 20, Problem 71P
Interpretation Introduction

Interpretation:

The mechanism for the rearrangement that converts an α-hydroxyimine to α-aminoketone in the presence of trace amount of acid has to be given.

Concept Introduction:

Keto-enol tautomerism” is defined as the rearrangement to a chemical equilibrium between a keto form and an enol.  The enol and keto forms are said to be tautomers of each other.

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The following three derivatives of succinimide are anticonvulsants and have found use in the treatment of epilepsy, particularly petit mal seizures. Ph Ph `N' `N' ČH3 ČH3 Methsuximide Ethosuximide Phensuximide Following is a synthesis of phensuximide. CN Ph CN Ph CN 1. NaOH, H2O 2. HC, Н20 NaOEt KCN Ph-CHO cOOEt H cOOEt NC COOEt 3. Нeat Ethyl cyanoacetate (A) (B) Benzaldehyde Ph Ph Ph CH;NH2 НООС СООН Et0oC COOEt `N' (C) (D) ČH3 Phensuximide Methsuximide is formed by a similar pathway to that shown for phensuximide. Draw the structure of the compound that reacts with ethyl cyanoacetate in the synthesis of methsuximide.
The following three derivatives of succinimide are anticonvulsants and have found use in the treatment of epilepsy, particularly petit mal seizures. Ph. Ph `N' ČH3 ČH3 Methsuximide Ethosuximide Phensuximide Following is a synthesis of phensuximide. CN Ph CN Ph CN NaOEt KCN 1. NaOH, H2O Ph-CHO 2. HС, Н20 COOET H cOOEt NC COOEt 3. Нeat Ethyl cyanoacetate (A) (B) Benzaldehyde Ph. Ph Ph CH3NH2 НООС СООН EtOOC COOET `N' (C) (D) ČH3 Phensuximide In the conversion of (B) to (C), draw the structure of the product of step 1.
The addition of a nucleophilic group like a thiol (-SH), or an unprotonated amino group (-NH₂) to an a,ß-unsaturated ketone is important for understanding how NAPQI reacts with glutathione, N-acetylcysteine, or protein amino acid side chains containing -SH or -NH2 groups. In this problem we will add mercaptoethanol to p-benzoquinone. p-Benzoquinone will be a simple model of NAPQI. +H H a single uncharged addition product This reaction will proceed in steps. First the H-S-R will add to the unsaturated ketone to give a charged addition product. Next, a simple proton transfer will form an uncharged adduct in which the 6-membered ring contains one carbonyl and a second enolic hydroxyl. The keto form next will tautomerize to its more stable enol form, and in doing so the 6-membered ring becomes aromatic with 6-π electrons. See page 14 of the lecture notes for Lecture 9 How ADME affects preclinical Drug Design February 24, 2023, where I have shown the mechanism for this addition and give the…

Chapter 20 Solutions

EBK ORGANIC CHEMISTRY

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