7 Compound 5 can be made from compound 1 in the following reaction sequence. Br OH step 2 step 1 + NaOH + P - R 2 step 5 + dil. H₂SO4 S 5 HOOC NC (a) Suggest a reagent P that can be used in step 1. (b) What name would you give for the reaction occurring in step 1? (c) Suggest a name for compound 2. Name: (d) Name the inorganic product R that is also formed in step 2. (e) Suggest the name of the mechanism for step 2. (f) Draw a fully labelled reaction mechanism for step 2. OH OH step 4 + HCN 3 step 3

7 Compound 5 can be made from compound 1 in the following reaction sequence. Br OH step 2 step 1 + NaOH + P - R 2 step 5 + dil. H₂SO4 S 5 HOOC NC (a) Suggest a reagent P that can be used in step 1. (b) What name would you give for the reaction occurring in step 1? (c) Suggest a name for compound 2. Name: (d) Name the inorganic product R that is also formed in step 2. (e) Suggest the name of the mechanism for step 2. (f) Draw a fully labelled reaction mechanism for step 2. OH OH step 4 + HCN 3 step 3

Organic Chemistry

8th Edition

ISBN:9781305580350

Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Publisher:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Chapter19: Enolate Anions And Enamines

Section19.9: Crossed Enolate Reactions Using Lda

Problem EQ

See similar textbooks

Similar questions

7. Compound AA, C4H8O, gives a positive result (formation of a silver mirror) when reacted with Tollen’s reagent. Reduction of compound AA with lithium aluminium hydride, LiAlH4 followed by acidified water, H3O+ produces an alcohol, BB. Oxidation of BB with hot acidified potassium dichromate, K2Cr2O7 gives butanoic acid, C3H7COOH. Esterification between butanoic acid and methanol, CH3OH produces compound CC. Dehydration of compound BB using concentrated sulphuric acid, H2SO4 at a temperature of 180°C produces compound DD. Draw the structural formula of compounds AA, BB, CC, and DD
When a mixture of ketone 11 and \alpha, \beta - unsaturated carbonyl 12 are exposed to substoichiometric amounts of NaOMe, product B is obtained selectively. Subsequent treatment of B with excess NaOMe leads to the exclusive formation of tricyclic product 13. (1) Suggest a structure for B and provide a reason for its selective formation. (ii) Provide a reaction mechanism for the formation of 13, which accounts for its selective formation.
1. Reaction of excess methyllithium with ethyl acetate (CH3CO2C2H5) produces, after acid work-up, ___. 2. Reaction of excess ethyl magnesium bromide with ethyl benzoate (C6H5CO2C2H5) produces, after acid work-up, ___. 3. Reaction of excess ethyl magnesium iodide with ethyl acetate (CH3CO2C2H5) produces, after acid work-up, ___.
1.Describe the ozonolysis of alkenes 2.one mole of a hydrocarbon(A) reacts with one mole of beomine giving a dibromo compound C5H10Br2.Substance A on treatment with cold dilute kMnO4 solution forms a compound C5C12O2(C5H12O2) on ozonolysis A,gives equimolar quantities of propanone and ethanol.Deduce the structure of substance A.
Doxaprost, an orally active bronchodilator patterned after the natural prostaglandins , is synthesized in the following series of reactions starting with ethyl 2-oxocyclopentanecarboxylate. Except for the Nef reaction in Step 8, we have seen examples of all other types of reactions involved in this synthesis. Q. Propose a set of experimental conditions to bring about the alkylation in Step 1. Account for the regioselectivity of the alkylation (i.e., that it takes place on the carbon between the two carbonyl groups rather than on the other side of the ketone carbonyl).
8. The preparation of the sex pheromone of the boll worm moth, (E)-9,11-dodecadien-1-yp acetate from compound A has been described. Suggest suitable reagents for each step in sequence.
Over the past several decades, chemists have developed a number of synthetic methodologies for the synthesis of steroid hormones. One of these, developed by Lutz Tietze at the Institut für Organische Chemie der Georg-August-Universität, Göttingen, Germany, used a double Heck reaction to create ring B of the steroid nucleus. As shown in the following retrosynthetic analysis, a key intermediate in his synthesis is compound (1). Two Heck reaction disconnects of this intermediate give compounds (2) and (3). Compound (2) contains the aromatic ring that becomes ring A of estrone. Compound (3) contains the fused five- and six-membered rings that become rings C and D of estrone. Q.Propose structural formulas for compounds (2) and (3).
Over the past several decades, chemists have developed a number of synthetic methodologies for the synthesis of steroid hormones. One of these, developed by Lutz Tietze at the Institut für Organische Chemie der Georg-August-Universität, Göttingen, Germany, used a double Heck reaction to create ring B of the steroid nucleus. As shown in the following retrosynthetic analysis, a key intermediate in his synthesis is compound (1). Two Heck reaction disconnects of this intermediate give compounds (2) and (3). Compound (2) contains the aromatic ring that becomes ring A of estrone. Compound (3) contains the fused five- and six-membered rings that become rings C and D of estrone. Q.Name the types of functional groups in estrone
Over the past several decades, chemists have developed a number of synthetic methodologies for the synthesis of steroid hormones. One of these, developed by Lutz Tietze at the Institut für Organische Chemie der Georg-August-Universität, Göttingen, Germany, used a double Heck reaction to create ring B of the steroid nucleus. As shown in the following retrosynthetic analysis, a key intermediate in his synthesis is compound (1). Two Heck reaction disconnects of this intermediate give compounds (2) and (3). Compound (2) contains the aromatic ring that becomes ring A of estrone. Compound (3) contains the fused five- and six-membered rings that become rings C and D of estrone. Q.How many chiral centers are present in estrone?
Over the past several decades, chemists have developed a number of synthetic methodologies for the synthesis of steroid hormones. One of these, developed by Lutz Tietze at the Institut für Organische Chemie der Georg-August-Universität, Göttingen, Germany, used a double Heck reaction to create ring B of the steroid nucleus. As shown in the following retrosynthetic analysis, a key intermediate in his synthesis is compound (1). Two Heck reaction disconnects of this intermediate give compounds (2) and (3). Compound (2) contains the aromatic ring that becomes ring A of estrone. Compound (3) contains the fused five- and six-membered rings that become rings C and D of estrone. Q.Show how your proposals for compounds (2) and (3) can be converted to compound (1). (Note: In the course of developing this synthesis, Tietze discovered that vinylic bromides and iodides are more reactive in Heck reactions than are aryl bromides and iodides.)
Over the past several decades, chemists have developed a number of synthetic methodologies for the synthesis of steroid hormones. One of these, developed by Lutz Tietze at the Institut für Organische Chemie der Georg-August-Universität, Göttingen, Germany, used a double Heck reaction to create ring B of the steroid nucleus. As shown in the following retrosynthetic analysis, a key intermediate in his synthesis is compound (1). Two Heck reaction disconnects of this intermediate give compounds (2) and (3). Compound (2) contains the aromatic ring that becomes ring A of estrone. Compound (3) contains the fused five- and six-membered rings that become rings C and D of estrone. Q. In the course of the double Heck reactions, two new chiral centers are created. Assume in compound (3), the precursor to rings C and D of estrone, that the fusion of rings C and D is trans and that the angular methyl group is above the plane of the ring. Given this stereochemistry, predict the stereochemistry of…
Doxaprost, an orally active bronchodilator patterned after the natural prostaglandins , is synthesized in the following series of reactions starting with ethyl 2-oxocyclopentanecarboxylate. Except for the Nef reaction in Step 8, we have seen examples of all other types of reactions involved in this synthesis. Q. Write equations to show that Step 6 can be brought about using either methanol or diazomethane (CH2N2) as a source of the -CH3 in the methyl ester.