lejimalide B, an anticancer agent with a 24-membered ring, is isolated from a tunicate found off le Island in Okinawa. (a) Label each double bond in iejimalide B as E or Z. (b) Label each tetrahedral stereogenic center as R or S. (c) How many stereoisomers are possible for iejimalide B? CH;0 CHO OCH, HO, iejimalide B
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- A key step in the synthesis of the narcotic analgesic meperidine (tradename Demerol) is the conversion of phenylacetonitrile to X. (a) What isthe structure of X? (b) What reactions convert X to meperidine ?(R)-Carvone, the major component of the oil of spearmint, undergoesacid-catalyzed isomerization to carvacrol, a major component of the oilof thyme. Draw a stepwise mechanism and explain why thisisomerization occurs.Treatment of compound A (C8H17Br) with NaOCH2CH3 affords two constitutional isomers B and C. Ozonolysis of B affords CH2=O and (CH3CH2CH2)2C=O. Ozonolysis of C affords CH3CH2CH2COCH3 and CH3CH2CHO. What is the structure of A?
- When (R)-6-bromo-2,6-dimethylnonane is dissolved in CH3OH,nucleophilic substitution yields an optically inactive solution. When theisomeric halide (R)-2-bromo-2,5-dimethylnonane is dissolved in CH3OHunder the same conditions, nucleophilic substitution forms an opticallyactive solution. Draw the products formed in each reaction, and explainwhy the difference in optical activity is observed.(-)-Hyoscyamine, an optically active drug used to treat gastrointestinal disorders, is isolated from atropabelladonna, the deadly nightshade plant, by a basic aqueous extraction procedure. If too much base is used during isolation, optically inactive material is isolated A) explain this result by drawing a stepwise mechanism(a) Explain how NaBH4 in CH3OH can reduce hemiacetal A to butane-1,4-diol (HOCH2CH2CH2CH2OH). (b) What product is formed when A is treated with Ph3P = CHCH2CH(CH3)2? (c) The drug isotretinoin is formed by reaction of X and Y. What is the structure of isotretinoin? Although isotretinoin (trade name Accutane or Roaccutane) is used for the treatment of severe acne, it is dispensed under strict controls because it also causes birth defects.
- The shrub ma huang (Section 5.4A) contains two biologically activestereoisomers—ephedrine and pseudoephedrine—with two stereogeniccenters as shown in the given structure. Ephedrine is one component ofa once-popular combination drug used by body builders to increaseenergy and alertness, whereas pseudoephedrine is a nasaldecongestant.a.) Draw the structure of naturally occurring (−)-ephedrine, which has the1R,2S configuration.b.) Draw the structure of naturally occurring (+)-pseudoephedrine, whichhas the 1S,2S configuration.c.) How are ephedrine and pseudoephedrine related?d.) Draw all other stereoisomers of (−)-ephedrine and (+) pseudoephedrine, and give the R,S designation for all stereogeniccenters.e.) How is each compound drawn in part (d) related to (−)-ephedrine?Friedel–Crafts alkylation of benzene with (R)-2-chlorobutane and AlCl3 affords sec-butylbenzene.a. How many stereogenic centers are present in the product?b. Would you expect the product to exhibit optical activity? Explain, with reference to the mechanism.Ibufenac, a para-disubstituted arene with the structureHO2CCH2C6H4CH2CH(CH3)2 , is a much more potent analgesic thanaspirin, but it was never sold commercially because it caused livertoxicity in some clinical trials. Devise a synthesis of ibufenac frombenzene and organic halides having fewer than five carbons.
- Although γ-butyrolactone is a biologically inactive compound, it isconverted in the body to 4-hydroxybutanoic acid (GHB), an addictive andintoxicating recreational drug. Draw a stepwise mechanism for thisconversion in the presence of acid.Ibufenac, a para-disubstituted arene with the structure HO2CCH26H4CH2CH(CH3)2, is a much more potent analgesic than aspirin, but it was never sold commercially because it caused liver toxicity in some clinical trials. Devise a synthesis of ibufenac from benzene and organic halides having fewer than five carbons.β-Vetivone is isolated from vetiver, a perennial grass that yields a variety of compounds used in traditional eastern medicine, pest control, and fragrance. In one synthesis, ketone A is converted to β-vetivone by a two-step process:Michael reaction, followed by intramolecular aldol reaction. (a) What Michael acceptor is needed for the conjugate addition? (See Problem 23.61 for another method to form the bicyclic ring system of β-vetivone.) (b) Draw a stepwise mechanism for the aldol reaction, which forms the six-membered ring.