PART I Synthetic Toolbox 1: Retrosynthesis and Protective Groups 1
CHAPTER 1.1 Retrosynthetic Analysis 3
Retrosynthesis by Functional Group Interconversion (FGI) 4
Retrosynthesis by Making a Disconnection 6
CHAPTER 1.2 Protective Groups 11
Protection of Ketones and Aldehydes 12
Protection of Alcohols 12
Protection of Carboxylic Acids 16
Protection of Amines 17
Part I Problems Protective Groups 19
PART II Synthetic Toolbox 2: Overview of Organic Transformations 21
CHAPTER 2.1 Nucleophiles and Electrophiles 23
Common Nucleophiles 23
Common Electrophiles 26
CHAPTER 2.2 Oxidation and Reduction Reactions 27
Overview of Oxidations and Reductions 27
Common Oxidation Reactions and Oxidizing Agents 29
Common Reduction Reactions and Reducing Agents 35
Part II Problems Nucleophiles, Electrophiles, and Redox 41
PART III Synthesis of Monofunctional Target Molecules (1-FG TMs) 45
CHAPTER 3.1 Synthesis of Alcohols (ROH) 47
Synthesis of Alcohols by Functional Group Interconversion (FGI) 48
Synthesis of Alcohols by the Grignard Reaction 50
Synthesis of Propargylic Alcohols (RC=CCH2OH) 56
Synthesis of Phenol Derivatives (ArOH) 57
Example: Alcohol TM 58
CHAPTER 3.2 Synthesis of Alkyl (RX) and Aryl Halides (ArX) 61
Synthesis of Alkyl Halides via Free-Radical Halogenation 61
Synthesis of Alkyl Halides via FGI 62
Retrosynthesis of Alkyl Halides 63
Synthesis of Aryl Halides (ArX) 63
Example: Alkyl Halide TM 64
CHAPTER 3.3 Synthesis of Ethers (ROR') 67
Williamson Ether Synthesis (RX + R'O- ? ROR') 67
Alternate Ether Preparations 68
Synthesis of Epoxides 69
Retrosynthesis of Ethers 70
Example: Ether TM 71
CHAPTER 3.4 Synthesis of Thiols (RSH) and Thioethers (RSR') 73
Example: Thioether TM 75
CHAPTER 3.5 Synthesis of Amines (RNH2) and Anilines (ArNH2) 77
Synthetic Equivalents of NH3 (RX ? RNH2) 78
Synthesis of Amines via Reduction Reactions 80
Retrosynthesis of Amines 82
Synthesis of Aniline Derivatives (ArNH2) 82
Example: Amine TM 83
CHAPTER 3.6 Synthesis of Alkenes (R2C=CR2) 85
Synthesis of Alkenes via FGI 85
Synthesis of Alkenes via the Wittig Reaction 88
Example: Alkene TM 90
CHAPTER 3.7 Synthesis of Alkynes (RC=CR') 93
Synthesis of Alkynes via FGI 93
Synthesis of Alkynes from Other Alkynes (RC=CH ? RC=CR') 94
Example 1: Alkyne TM 95
Example 2: Alkyne TM 95
CHAPTER 3.8 Synthesis of Alkanes (RH) 97
Synthesis of Alkanes via FGI 97
Synthesis of Alkanes via C-C Bond Formation 99
Retrosynthesis of Alkanes 101
Example: Alkane TM 102
CHAPTER 3.9 Synthesis of Aldehydes and Ketones (RCHO, R2C=O) 105
Synthesis of Aldehydes/Ketones via FGI 105
Synthesis of Aldehydes/Ketones via Acyl Substitutions 107
Synthesis of Ketones via a-Alkylation 109
Example: Ketone TM 113
CHAPTER 3.10 Synthesis of Carboxylic Acids (RCO2H) 115
Synthesis of Carboxylic Acids via FGI 115
Synthesis of Carboxylic Acids via Grignard (RMgBr + CO2 ? RCO2H) 116
Carboxylic Acids via a-Alkylation: Malonic Ester Synthesis 117
Example: Carboxylic Acid TM 119
CHAPTER 3.11 Synthesis of Carboxylic Acid Derivatives 121
Relative Reactivities of Carboxylic Acid Derivatives (RCOLG) 121
Synthesis of Acid Chlorides (RCOCl) 123
Synthesis of Anhydrides (RCO2COR) 124
Synthesis of Esters (RCO2R) 124
Synthesis of Amides (RCONH2) 128
Synthesis of Nitriles (RC=N) 131
Example: Carboxylic Acid Derivative 132
Part III Problems Monofunctional Target Molecules (1-FG TMs) 135
PART IV Synthesis of Target Molecules with Two Functional Groups (2-FG TMs) 139
CHAPTER 4.1 Synthesis of ß-Hydroxy Carbonyls and a,ß-Unsaturated Carbonyls 141
The Aldol Reaction 141
Synthesis of a,ß-Unsaturated Esters Using the Wittig Reaction 149
Example: a,ß-Unsaturated Carbonyl 150
CHAPTER 4.2 More Enolate Reactions: Synthesis of 1,3-Dicarbonyls, 1,5-Dicarbonyls, and Cyclohexenones 153
The Claisen Condensation 153
The Michael Reaction 157
Summary of Enolate Syntheses 161
Robinson Annulation 162
CHAPTER 4.3 "Illogical" Disconnections: Umpolung (Polarity Reversal) 165
Synthesis of TMs with a 1,2-Dioxygenated Pattern 165
Synthesis of TMs with a 1,4-Dioxygenated Pattern 171
Synthesis of TMs with a 1,6-Dicarbonyl Pattern 175
Part IV Problems Target Molecules with Two Functional Groups (2-FG TMs) 177
PART V Synthesis of Aromatic Target Molecules 181
CHAPTER 5.1 Electrophilic Aromatic Substitution (ArH + E+ ? ArE) 183
Mechanism of the Electrophilic Aromatic Substitution 183
Electrophiles for the Electrophilic Aromatic Substitution 183
Electrophilic Aromatic Substitution on Substituted Benzenes 185
Retrosynthesis of Aromatic TMs (Electrophilic Aromatic Substitution) 191
Example: Aromatic TM 1 193
CHAPTER 5.2 Synthesis of Aromatic TMs via Diazonium Salts (ArN2+ + Nu ? ArNu) 195
Preparation of Diazonium Salts (ArNH2 ? ArN2+) 195
Use of Diazonium Salts (ArN2+ + Nu ? ArNu) 195
Retrosynthesis of Aromatic TMs (via Diazonium Salts) 196
Example: Aromatic TM 2 197
CHAPTER 5.3 Nucleophilic Aromatic Substitution (ArX + Nu: ? ArNu) 199
Mechanism of Nucleophilic Aromatic Substitution (SNAr) 199
Retrosynthesis of Aromatic TMs (SNAr) 200
Example: Aromatic TM 3 201
Part V Problems Aromatic TMs 203
PART VI Synthesis of Compounds Containing Rings 207
CHAPTER 6.1 Synthesis of Cyclopropanes 209
Retrosynthesis of Cyclopropane TMs 210
CHAPTER 6.2 Synthesis of Cyclobutanes 213
Retrosynthesis of Cyclobutane TMs 213
CHAPTER 6.3 Synthesis of Five-Membered Rings (Radical Cyclization Reactions) 215
Baldwin's Rules 216
Retrosynthesis of Methylcyclopentane TMs 216
Example: Methylcyclopentane TM 217
CHAPTER 6.4 Synthesis of Six-Membered Rings (Diels–Alder Reaction) 219
The Dienophile (E+) 220
The Diene (Nu:) 221
Regiochemistry of the Diels-Alder 223
Retrosynthesis of Cyclohexenes (Diels-Alder) 225
Retrosynthesis of 1,4-Cyclohexadienes 226
Part VI Problems Cyclic TMs 229
PART VII Predicting and Controlling Stereochemistry 233
CHAPTER 7.1 Reactions That Form Racemates 235
Formation of New Chiral Carbons 235
Loss of a Group from a Chiral Carbon: Racemization 238
CHAPTER 7.2 SN2 Mechanism: Backside Attack 241
CHAPTER 7.3 Elimination Mechanisms 243
E2 Elimination (Anti) 243
Cope Elimination (Syn) 244
CHAPTER 7.4 Additions to Alkenes and Alkynes 245
Syn Additions 245
Anti Additions 246
CHAPTER 7.5 Additions to Carbonyls 249
Diastereoselectivity in Acyclic Systems: Cram's Rule, Felkin-Ahn Model 249
Chelation Control by Neighboring Groups 251
Addition to Cyclohexanones 252
CHAPTER 7.6 Additions to Enolates: Aldol Stereochemistry 253
Formation of (E) and (Z) Enolates 253
Aldol Reaction with (E) and (Z) Enolates 254
Examples: Predicting Aldol Stereochemistry 255
CHAPTER 7.7 Enantioselectivity and Asymmetric Syntheses 257
Prochiral Environments 257
Enantioselective Techniques 259
Part VII Problems Stereochemistry 263
Solutions to Problems 267
Solutions to Part I: Protective Groups 267
Solutions to Part II: Nucleophiles, Electrophiles, and Redox 270
Solutions to Part III: Monofunctional Target Molecules (1-FG TMs) 274
Solutions to Part IV: Difunctional Target Molecules (2-FG TMs) 286
Solutions to Part V: Aromatic TMs 303
Solutions to Part VI: Cyclic TMs 310
Solutions to Part VII: Stereochemistry 320
Index 331
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