Organic Chemistry
9th Edition
ISBN: 9781305080485
Author: John E. McMurry
Publisher: Cengage Learning
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Question
Chapter 21.SE, Problem 38MP
Interpretation Introduction
Interpretation:
A mechanism for the formation of 2,5-diketopiperazine when an α- amino acid is treated with DCC is to be proposed.
Concept introduction:
The reaction involves two steps i) Reaction of amino acid molecules with DCC to produce a dipeptide ii) Reaction of the dipeptide with DCC to yield 2,5-diketopiperazine.
To propose:
A mechanism for the formation of 2,5-diketopiperazine when an α- amino acid is treated with DCC.
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Treatment of an a-amino acid with DCC
yields a 2,5-diketopiperazine. Propose a
mechanism.
H3N,
DCC
Wー4
HR
タール
R
An a-amino acid
A 2,5-diketopiperazine
A variation of the acetamidomalonate synthesis can be used to synthesize serine. The process involves the following steps:
Ethoxide ion deprotonates diethyl acetamidomalonate, forming enolate anion 1;
Enolate anion 1 makes a nucleophilic attack on formaldehyde, forming tetrahedral intermediate 2;
Protonation of the oxyanion forms alcohol 3;
Acid hydrolysis yields dicarboxyamino alcohol 4;
Decarboxylation leads to the final amino acid.
Write out the mechanism on a separate sheet of paper, and then draw the structure of tetrahedral intermediate 2.
You do not have to consider stereochemistry.
You do not have to explicitly draw H atoms.
Do not include lone pairs in your answer. They will not be considered in the grading.
Draw carboxyl and amino groups in their uncharged forms.
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.
Chapter 21 Solutions
Organic Chemistry
Ch. 21.1 - Give IUPAC names for the following substances:Ch. 21.1 - Draw structures corresponding to the following...Ch. 21.2 - Prob. 3PCh. 21.2 - Rank the compounds in each of the following sets...Ch. 21.2 - Predict the products of the following nucleophilic...Ch. 21.2 - Prob. 6PCh. 21.3 - Prob. 7PCh. 21.3 - If the following molecule is treated with acid...Ch. 21.4 - How might you prepare the following esters using a...Ch. 21.4 - Prob. 10P
Ch. 21.4 - Prob. 11PCh. 21.4 - Prob. 12PCh. 21.4 - Prob. 13PCh. 21.5 - Prob. 14PCh. 21.5 - What product would you expect from reaction of one...Ch. 21.6 - Prob. 16PCh. 21.6 - Prob. 17PCh. 21.6 - Show the products you would obtain by reduction of...Ch. 21.6 - What ester and what Grignard reagent might you...Ch. 21.7 - Prob. 20PCh. 21.7 - How would you use the reaction of an amide with...Ch. 21.8 - Write the mechanism of the reaction shown in...Ch. 21.9 - Prob. 23PCh. 21.9 - Prob. 24PCh. 21.10 - Prob. 25PCh. 21.10 - Prob. 26PCh. 21.SE - Name the following compounds:Ch. 21.SE - Prob. 28VCCh. 21.SE - Prob. 29VCCh. 21.SE - Prob. 30VCCh. 21.SE - Predict the product(s) and provide the mechanism...Ch. 21.SE - Predict the product(s) and provide the mechanism...Ch. 21.SE - Predict the product(s) and provide the mechanism...Ch. 21.SE - Predict the product(s) and provide the complete...Ch. 21.SE - Prob. 35MPCh. 21.SE - When 4-dimethylaminopyridine (DMAP) is added in...Ch. 21.SE - Prob. 37MPCh. 21.SE - Prob. 38MPCh. 21.SE - Prob. 39MPCh. 21.SE - The hydrolysis of a biological thioester to the...Ch. 21.SE - Prob. 41MPCh. 21.SE - Prob. 42MPCh. 21.SE - Prob. 43MPCh. 21.SE - In the iodoform reaction, a triiodomethyl ketone...Ch. 21.SE - Give IUPAC names for the following compounds:Ch. 21.SE - Prob. 46APCh. 21.SE - Draw and name compounds that meet the following...Ch. 21.SE - Predict the product, if any, of reaction between...Ch. 21.SE - Prob. 49APCh. 21.SE - Prob. 50APCh. 21.SE - What product would you expect to obtain from...Ch. 21.SE - Prob. 52APCh. 21.SE - Prob. 53APCh. 21.SE - The following reactivity order has been found for...Ch. 21.SE - Prob. 55APCh. 21.SE - Outline methods for the preparation of...Ch. 21.SE - Prob. 57APCh. 21.SE - When ethyl benzoate is heated in methanol...Ch. 21.SE - tert-Butoxycarbonyl azide, a reagent used in...Ch. 21.SE - Prob. 60APCh. 21.SE - Prob. 61APCh. 21.SE - What is the structure of the polymer produced by...Ch. 21.SE - Polyimides with the structure shown are used as...Ch. 21.SE - Prob. 64APCh. 21.SE - Propose a structure for a compound, C4H7ClO2, that...Ch. 21.SE - Assign structures to compounds with the following...Ch. 21.SE - Prob. 67APCh. 21.SE - When a carboxylic acid is dissolved in...Ch. 21.SE - Prob. 69APCh. 21.SE - Prob. 70APCh. 21.SE - Prob. 71APCh. 21.SE - Phenyl 4-aminosalicylate is a drug used in the...Ch. 21.SE - N,N-Diethyl-m-toluamide (DEET) is the active...Ch. 21.SE - Tranexamic acid, a drug useful against blood...Ch. 21.SE - One frequently used method for preparing methyl...Ch. 21.SE - Prob. 76APCh. 21.SE - Assign structures to compounds with the following...Ch. 21.SE - Propose structures for compounds with the...Ch. 21.SE - Propose a structure for the compound with the...Ch. 21.SE - Draw the structure of the compound that produced...Ch. 21.SE - Prob. 81APCh. 21.SE - Epoxy adhesives are prepared in two steps. SN2...
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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' 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.arrow_forwardWhen an α-hydroxy amide is treated with Br2 in aqueous NaOH under Hofmann rearrangement conditions, loss of CO2 occurs and a chain-shortened aldehyde is formed. The mechanism involves the following steps: Base abstracts an acidic amide proton, yielding amide anion 1; The amide anion reacts with bromine in an α-substitution reaction to give N-bromoamide 2. Abstraction of the remaining amide proton by base gives a resonance-stabilized bromoamide anion 3; Rearrangement occurs to yield isocyanate 4; Water adds to the isocyanate to yield carbamic acid 5; Elimination of CO2 yields carbinolamine 6; Following proton transfer, expulsion of ammonia yields the final product aldehyde. Write out the mechanism and then draw the structures of bromoamide anion 3 and amide anion 1.arrow_forwardShow how phenylalanine can be prepared by reductive amination of an α-ketocarboxylic acid.arrow_forward
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