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Successful Drug Discovery, Volume 1
Description:
The first volume of the book series Successful Drug Discovery is focusing on new drug discoveries during
the last decade, from established drugs to recently introduced drugs of all kinds: small–molecule–, peptide–,
and protein–based drugs.
The role of serendipity is analyzed in some very successful drugs where the research targets of the lead
molecule and the drug are different. Phenotypic and target–based drug discovery approaches are discussed
from the viewpoint of pioneer drugs and analogues.
This volume gives an excellent overview of insulin analogues including a discussion of the properties of
rapid–acting and long–acting derivatives of this important hormone.
The major part of the book is devoted to case histories of new drug discoveries described by their key
inventors. Eight case histories range across many therapeutic fields.
The goal of this book series is to help the participants of the drug research community with a reference book
series and to support teaching in medicinal chemistry with case histories and review articles of new drugs.
Contents:
Preface XIII
List of Contributors XVII
Part I General Aspects 1
1 Serendipitous Target–Based Drug Discoveries 3
János Fischer and David P. Rotella
1.1 Introduction 3
1.2 Recent Examples of Target–Based Drug Discovery 4
1.3 Serendipitous Target–Based Drug Discoveries 7
1.4 Drospirenone (Contraceptive with Anti–aldosterone Activity) 7
1.4.1 Summary of Drospirenone Discovery 8
1.5 Escitalopram (Selective Serotonin Reuptake Inhibitor Antidepressant) 9
1.5.1 Summary of the Escitalopram Discovery 11
1.6 Ezetimibe (Inhibitor of Cholesterol Absorption) 11
1.6.1 Summary of Ezetimibe Discovery 13
1.7 Lamotrigine (Discovery of a Standalone Drug for the Treatment of Epilepsy) 13
1.7.1 Summary of Lamotrigine Discovery 15
1.8 Omeprazole (Proton Pump Inhibitor Acid–Suppressive Agent) 15
1.8.1 Summary of Omeprazole Discovery 16
1.9 Outlook 17
Acknowledgments 17
List of Abbreviations 17
References 18
2 Drug Discoveries and Molecular Mechanism of Action 19
David C. Swinney
2.1 Introduction 19
2.2 Mechanistic Paradox 19
2.3 Molecular Mechanism of Action 20
2.3.1 The Primary Driver of an Optimal MMOA is the Potential for Mechanism–Based Toxicity 22
2.3.2 Details of MMOA are not Captured by IC50 and KI 22
2.3.3 Metrics, Biochemical Efficiency 24
2.4 How MMOAs were Discovered 25
2.4.1 MMOAs of Medicines Approved by the USFDA Between 1999 and 2008 27
2.5 Case Study: Artemisinin 30
2.6 Summary 31
List of Abbreviations 32
References 32
Part II Drug Class 35
3 Insulin Analogs
John M. Beals
Improving the Therapy of Diabetes 37
3.1 Introduction 37
3.2 Pharmacology and Insulin Analogs 38
3.3 Chemical Description 39
3.4 Rapid–Acting Insulin Analogs (Prandial or Bolus Insulin) 41
3.5 Long–Acting Insulin Analog Formulations (Basal Insulin) 48
3.6 Conclusions and Future Considerations 54
List of Abbreviations 55
References 55
Part III Case Histories 61
4 The Discovery of Stendra (Avanafil) for the Treatment of Erectile Dysfunction 63
Koichiro Yamada, Toshiaki Sakamoto, Kenji Omori, and Kohei Kikkawa
4.1 Introduction 63
4.2 Discovery of Avanafil 65
4.2.1 Differentiation Strategies to Develop a New Drug 65
4.2.2 Discovery of Isoquinoline Derivatives from Isoquinolinone Lead 65
4.2.3 Scaffold–Hopping Approaches from the Isoquinoline Leads 67
4.2.3.1 Monocyclic Type A Series: Tetrasubstituted Pyrimidine Derivatives 68
4.2.3.2 Monocyclic Type B Series: Trisubstituted Pyrimidine Derivatives 68
4.2.3.3 SAR of Substitution at the 2–Position of the Pyrimidine Ring (15) 70
4.2.3.4 SAR of Substitution at the 4–Position of the Pyrimidine Ring (16) 70
4.2.3.5 SAR of Substitution at the 5–Position of the Pyrimidine Ring (19, 20) 73
4.2.3.6 Core Structure Modifications of the Pyrimidine Nucleus of Avanafil 73
4.3 Pharmacological Features of Avanafil 75
4.3.1 PDE Inhibitory Profiles 75
4.3.2 In Vivo Pharmacology 76
4.3.2.1 Potentiation of Penile Tumescence in Dogs 76
4.3.2.2 Influence on Retinal Function in Dogs 79
4.3.2.3 Influence on Hemodynamics in Dogs 79
4.3.2.4 Influence on Nitroglycerin (NTG)–Induced Hypotension in Dogs 80
4.4 Clinical Studies of Avanafil 81
4.5 Conclusion 83
List of Abbreviations 83
References 83
5 Dapagliflozin, A Selective SGLT2 Inhibitor for Treatment of Diabetes 87
William N.Washburn
5.1 Introduction 87
5.2 Role of SGLT2 Transporters in Renal Function 88
5.3 O–Glucoside SGLT2 Inhibitors 89
5.3.1 Hydroxybenzamide O–Glucosides 90
5.3.2 Benzylpyrazolone O–Glucosides 94
5.3.3 o–Benzylphenol O–Glucosides 95
5.4 m–Diarylmethane C–Glucosides 97
5.4.1 Synthetic Route 98
5.4.2 Early SAR of C–Glucoside Based SGLT2 Inhibitors 99
5.4.3 Identification of Dapagliflozin 102
5.5 Profiling Studies with Dapagliflozin 105
5.6 Clinical Studies with Dapagliflozin 108
5.7 Summary 108
List of Abbreviations 109
References 110
6 Elvitegravir, A New HIV–1 Integrase Inhibitor for Antiretroviral Therapy 113
Hisashi Shinkai
6.1 Introduction 113
6.2 Discovery of Elvitegravir 114
6.2.1 HIV–1 Integrase and Diketo Acid Inhibitors 114
6.2.2 Monoketo Acid Integrase Inhibitors and Elvitegravir 116
6.3 Conclusion 121
List of Abbreviations 123
References 123
7 Discovery of Linagliptin for the Treatment of Type 2 Diabetes Mellitus 129
Matthias Eckhardt, Thomas Klein, Herbert Nar, and Sandra Thiemann
7.1 Introduction 129
7.2 Discovery of Linagliptin
HighThroughput Screening Hit Optimization 130
7.3 Rationalization of DPP–4 Inhibition Potency by Crystal Structure Analysis and Studies of Binding Kinetics
139
7.4 Basic Physicochemical, Pharmacological, and Kinetic Characteristics 141
7.5 Preclinical Studies 143
7.5.1 Glucose Regulation by Linagliptin 143
7.5.2 Effects of Linagliptin on the Kidney 145
7.6 Clinical Studies 146
7.6.1 Clinical Pharmacokinetics 146
7.6.2 Clinical Pharmacodynamics 148
7.6.2.1 Inhibition of DPP–4 148
7.6.2.2 Effects on Glucagon–Like Peptide–1 and Hyperglycemia 148
7.6.3 Clinical Use in Special Patient Populations 148
7.6.3.1 Patients with Renal Impairment 148
7.6.3.2 Patients with Hepatic Impairment 150
7.6.4 Cardiovascular Safety 150
7.7 Conclusion 151
List of Abbreviations 151
References 152
8 The Discovery of Alimta (Pemetrexed) 157
Edward C. Taylor
List of Abbreviations 175
References 176
9 Perampanel: A Novel, Noncompetitive AMPA Receptor Antagonist for the Treatment of Epilepsy 181
Shigeki Hibi
9.1 Introduction 181
9.1.1 Competitive Receptor Antagonists 182
9.1.2 Noncompetitive Receptor Antagonists 182
9.2 Seeds Identification by High Throughput Screening (HTS) Assays 183
9.3 Structure and Activity Relationship (SAR) Study Starting from the Unique Structure of Seed Compounds
184
9.3.1 Introduction of Conjugated Aromaticity 184
9.3.2 Discovery of 1,3,5–Triaryl–1H–pyridin–2–one Template 184
9.3.3 Optimization of 1,3,5–Triaryl–1H–pyridin–2–one Derivatives 185
9.4 Pharmacological Properties of Perampanel; Selection for Clinical Development 187
9.4.1 The Pharmacological Evaluation of Perampanel 187
9.4.2 The Pharmacokinetic Evaluation of Perampanel 189
9.5 Clinical Development of Perampanel 189
9.5.1 Phase I 189
9.5.2 Phase II and Phase III 190
9.6 Conclusion 190
List of Abbreviations 190
References 191
10 Discovery and Development of Telaprevir (Incivek ) A Protease Inhibitor to Treat Hepatitis C Infection
195
Bhisetti G. Rao, Mark A. Murcko, Mark J. Tebbe, and Ann D. Kwong
10.1 Introduction 195
10.1.1 Crystal Structure of NS3/4A Protease 196
10.1.2 Assays 196
10.2 Discussion 197
10.2.1 Substrate–Based Inhibitor Design 197
10.2.2 Structure–Based Inhibitor Optimization 200
10.2.3 Pre–Clinical Development 206
10.2.4 Clinical Development 206
10.3 Summary 207
List of Abbreviations 208
References 209
11 Antibody Drug Conjugates: Design and Development of Trastuzumab Emtansine (T–DM1) 213
Sandhya Girish, Gail D. Lewis Phillips, Fredric S. Jacobson, Jagath R. Junutula, and Ellie Guardino
11.1 Introduction 213
11.2 Molecular Design of T–DM1 214
11.3 Strategies for Bioanalysis 216
11.4 Strategies for Chemistry and Manufacturing Control 218
11.5 Nonclinical Development 219
11.6 Clinical Pharmacology 220
11.7 Clinical Trials and Approval 222
11.8 Summary 224
List of Abbreviations 225
References 226
Index 231
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