Organic Chemistry
11th Edition
ISBN: 9781118133576
Author: T. W. Graham Solomons, Craig Fryhle
Publisher: Wiley, John & Sons, Incorporated
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Textbook Question
Chapter 17, Problem 44P
Cantharidin is a powerful vesicant that can be isolated from dried beetles (Cantharis vesicatoria, or “Spanish fly”). Outlined here is the stereospecific synthesis of cantharidin reported by Gilbert Stork (Columbia University). Supply the missing reagents (a)–(n).
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Verapamil, a coronary artery vasodilator, is used in the treatment of angina caused by insufficient blood flow to cardiac muscle. Even though its effect on coronary vasculature tone was recognized over 30 years ago, only recently has its role as a calcium channel blocker become understood. Following is a retrosynthetic analysis leading to a convergent synthesis; it is convergent because (A) and (B) are made separately and then combined (i.e., the route converges) to give the final product. Convergent syntheses are generally much more efficient than those in which the skeleton is built up stepwise.
Q. Two steps are required to convert (D) to (C). The first is treatment of (D) with ethyl chloroformate. What is the product of this first step? What reagent can be used to convert this product to (C)?
Verapamil, a coronary artery vasodilator, is used in the treatment of angina caused by insufficient blood flow to cardiac muscle. Even though its effect on coronary vasculature tone was recognized over 30 years ago, only recently has its role as a calcium channel blocker become understood. Following is a retrosynthetic analysis leading to a convergent synthesis; it is convergent because (A) and (B) are made separately and then combined (i.e., the route converges) to give the final product. Convergent syntheses are generally much more efficient than those in which the skeleton is built up stepwise.
Q. How do you account for the regioselectivity of the nucleophilic displacement involved in converting (C) to (B)?
Chapter 17 Solutions
Organic Chemistry
Ch. 17 - Practice Problem 17.1 Give an IUPAC systematic...Ch. 17 - Prob. 2PPCh. 17 - PRACTICE PROBLEM
17.3 Which acid of each pair...Ch. 17 - Practice Problem 17.3 Write structural formulas...Ch. 17 - Practice Problem 17.4
Show how each of the...Ch. 17 - Practice Problem 17.5
Show how you could prepare...Ch. 17 - Practice Problem 17.6
(a) Which of the carboxylic...Ch. 17 - Prob. 8PPCh. 17 - Prob. 9PPCh. 17 - Practice Problem 17.9
Esters can also be...
Ch. 17 - Prob. 11PPCh. 17 - Prob. 12PPCh. 17 - Practice Problem 17.12
What products would you...Ch. 17 - Practice Problem 17.13 (a) Provide the reagents...Ch. 17 - Prob. 15PPCh. 17 - Practice Problem 17.15 Using decarboxylation...Ch. 17 - Practice Problem 17.16 Diacyl peroxides, ,...Ch. 17 - Prob. 18PCh. 17 - Give an IUPAC systematic or common name for each...Ch. 17 - Prob. 20PCh. 17 - Prob. 21PCh. 17 - 17.21 What major organic product would you expect...Ch. 17 - Prob. 23PCh. 17 - Prob. 24PCh. 17 - Prob. 25PCh. 17 - Prob. 26PCh. 17 - 17.26 What products would you expect to obtain...Ch. 17 - Write structural formulas for the major organic...Ch. 17 - 17.28 Indicate reagents that would accomplish each...Ch. 17 - Write structural formulas for the major organic...Ch. 17 - Prob. 31PCh. 17 - Prob. 32PCh. 17 - Prob. 33PCh. 17 - 17.33 On heating,...Ch. 17 - Prob. 35PCh. 17 - Prob. 36PCh. 17 - 17.36 Show how pentanoic acid can be prepared from...Ch. 17 - 17.37 The active ingredient of the insect...Ch. 17 - Prob. 39PCh. 17 - Prob. 40PCh. 17 - Give stereochemical formulas for compounds AQ:...Ch. 17 - 17.41 -Glyceraldehyde can be transformed into...Ch. 17 - Prob. 43PCh. 17 - 17.44 Cantharidin is a powerful vesicant that can...Ch. 17 - Prob. 45PCh. 17 - 17.44 Given here are the NMR spectra and carbonyl...Ch. 17 - Compound X (C7H12O4) is insoluble in aqueous...Ch. 17 - 17.45 Compound Y dissolves slowly when warmed...Ch. 17 - Prob. 49PCh. 17 - Prob. 50PCh. 17 - 17.52 Starting with 1-naphthol, suggest an...Ch. 17 - Suggest a synthesis of ibuprofen (Section 5.11)...Ch. 17 - Prob. 53PCh. 17 - Prob. 54PCh. 17 - Prob. 1LGPCh. 17 - Prob. 2LGPCh. 17 - Prob. 3LGPCh. 17 - Prob. 4LGPCh. 17 - Prob. 1QCh. 17 - 17.2 Which of the following would yield...Ch. 17 - 17.3 Which reagent would serve as the basis for a...Ch. 17 - Prob. 4QCh. 17 - Complete the following synthesis.Ch. 17 - 17.6 Which of these acids would undergo...
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