Introduction .............................................. ХIII
Glossary and Abbreviations .................................. XV
Part I Introduction ......................................... 1
1 The Drug Discovery Process ................................... 3
1.1 Pharmacokinetics-Structure Relationship ................. 5
1.2 The Future of S mall-Molecule Drags ..................... 9
References .................................................. 11
2 Lead Optimization ........................................... 13
2.1 What Limits/Reduces Oral Bioavailability? .............. 14
2.2 What Limits/Reduces Plasma Half-Life? .................. 15
2.3 How to Improve bbb-Penetration? ........................ 16
2.4 How to Avoid CYP Inhibition/Induction? ................. 16
2.5 How to Avoid Interaction with the Human
Ether-à-go-go-Related Gene (hERG)? ..................... 17
2.6 How to Prevent Toxicity? ............................... 17
2.7 Examples of PK-Optimization in Animals ................. 20
2.7.1 Dihydroorotate Dehydrogenase Inhibitors ......... 20
2.7.2 Matrix Metalloproteinase Inhibitors ............. 21
2.7.3 Antibacterial Aminobenzenesulfonamides .......... 21
2.7.4 Tyrosine Kinase Inhibitors ...................... 22
2.7.5 5-HT1A Agonists ................................. 23
2.7.6 Dipeptidyl Peptidase IV Inhibitors; Structural
Variations of Sitagliptin ....................... 23
2.7.7 P-Selectin Inhibitors ........................... 24
2.7.8 β3-Adrenergic Agonists .......................... 24
2.7.9 Vanilloid-1 Antagonists ......................... 25
2.7.10 HIV Protease Inhibitors ......................... 25
2.7.11 Matrix Metalloproteinase Inhibitors (Tested in
Rats) ........................................... 26
2.7.12 HIV Integrase Inhibitors ........................ 26
2.7.13 Dopamine D3 Antagonists ......................... 27
2.7.14 Inhibitors of Soluble Epoxide Hydrolase
(Tested in Mice, po) ............................ 28
2.7.15 Melanin-Concentrating Hormone Receptor-1
Antagonists ..................................... 29
References ............................................. 29
Part II The Pharmacokinetic Properties of Compound Classes ..... 33
3 Alkanes ..................................................... 35
3.1 Metabolism ............................................. 36
References .................................................. 39
4 Alkenes and Alkynes ......................................... 40
4.1 Metabolism ............................................. 40
References .................................................. 44
5 Arenes ...................................................... 45
5.1 Metabolism ............................................. 45
6 Halides ..................................................... 49
6.1 Fluorine ............................................... 49
6.2 Chlorine ............................................... 51
6.3 Bromine ................................................ 53
6.4 Iodine ................................................. 53
6.5 Alkylating Agents ...................................... 54
Reference ................................................... 55
7 Azides ...................................................... 58
8 Nitro Compounds .......................................... 59
8.1 Metabolism ............................................. 60
9 Azo Compounds ............................................... 62
10 Triazenes ................................................... 64
11 Nitrates and Nitrites ....................................... 66
Further Reading ............................................. 67
12 N-Nitroso Compounds ......................................... 68
13 N-Oxides .................................................... 70
14 Alcohols .................................................... 71
14.1 Metabolism ............................................. 72
15 Phenols ..................................................... 82
References .................................................. 84
16 Ethers ...................................................... 91
16.1 Metabolism ............................................. 92
Reference ................................................... 93
17 Epoxides .................................................... 96
18 Peroxides ................................................... 97
19 Thiols ...................................................... 98
20 Thioethers ................................................. 100
20.1 Metabolism ............................................ 101
Reference .................................................. 103
21 Sulfoxides ................................................. 104
22 Sulfones ................................................... 106
23 Aliphatic Amines ........................................... 107
23.1 Basicity .............................................. 130
23.2 Metabolism ............................................ 110
23.3 Rates of N-Dealkylation ............................... 112
Reference .................................................. 114
24 Quaternary Ammonium Salts .................................. 118
Reference .................................................. 119
25 Amidines ................................................... 120
Reference .................................................. 121
26 Cuanidines, Acylguanidines, and Biguanides ................. 122
26.1 Acylguanidines ........................................ 123
26.2 Biguanides ............................................ 123
Reference .................................................. 124
27 Anilines ................................................... 133
27.1 Metabolism ............................................ 135
28 Hydrazines, Acylhydrazines, and Hydrazones ................. 137
29 Aldehydes .................................................. 138
30 Ketones .................................................... 139
31 Carboxylic Acids ........................................... 144
31.1 Metabolism ............................................ 145
31.2 Bioisosteres of Carboxylic Acids ...................... 146
31.3 Amino Carboxylic Acids, N-Acyl Amino Acids, and
Related Compounds ..................................... 147
References ................................................. 348
32 Carboxylic Esters .......................................... 164
Reference .................................................. 165
33 Amides ..................................................... 366
34 Lactams and Imides ......................................... 172
34.1 Pyrazolone Antipyretics ............................... 372
34.2 Five-Membered Lactams as Nootropics ................... 173
References ................................................. 374
35 Nitriles ................................................... 384
References ................................................. 185
36 Carbonates ................................................. 186
37 Carbamates ................................................. 387
37.1 Carbamates as Hypnotics ............................... 388
References ................................................. 389
38 Ureas ...................................................... 392
Reference .................................................. 393
39 Thiocarbonyl Compounds ..................................... 201
40 Sulfonic Acids ............................................. 203
41 Sulfonic Esters ............................................ 206
42 Sulfates and Sulfamic Acids ................................ 207
43 Phosphonic Acids ........................................... 209
44 Phosphoric Acid Derivatives ................................ 213
45 N-(Aminoalkyl)benzamides, -Benzoates, and Related
Compounds .................................................. 215
Reference .................................................. 216
46 Arylalkylamines ............................................ 225
46.1 Antihistaminics: History .............................. 225
Reference .................................................. 226
47 Phenethylamines (2-Phenylethylamines) ...................... 267
47.1 Biological Activity of Phenethylamines ................ 267
47.2 Metabolism ............................................ 268
47.3 Tetrahydroisochinolines and Related Compounds ......... 269
Further Reading ............................................ 270
48 Aminoalkylindoles and Indole Alkaloids ..................... 291
Reference .................................................. 291
49 Phenothiazines ............................................. 301
49.1 Metabolism ............................................ 302
References ................................................. 302
50 Dibenzazepines and Related Tricyclic Compounds ............. 310
51 3-Aryloxy-2-Hydroxypropylamines (β-Adrenergic
Antagonists; β-Blockers") .................................. 320
51.1 Metabolism ............................................ 320
52 Opiates .................................................... 329
Reference .................................................. 329
53 N-(Carboxyalkyl)-α-Amino Acid Amides (Prils) ............... 335
Reference .................................................. 336
54 Anilides and Amides of Glycine ............................. 341
55 Peptides, Peptidomimetics, and Related Oligoamides ......... 347
55.1 Peptidomimetics ....................................... 348
55.2 Thrombin Inhibitors and Related Compounds ............. 349
References ............................................ 350
56 Oligoarylamines, Oligoarylamides, Oligoarylcarbamates,
and Oligoarylureas ......................................... 365
References ................................................. 365
57 Imidazoles ................................................. 377
References ................................................. 378
58 Triazoles .................................................. 387
59 Pyridines, Pyrimidines, and Related Compounds .............. 393
59.1 Proton Pump Inhibitors ................................ 396
References ................................................. 397
60 Quinolines ................................................. 412
60.1 Tecans ................................................ 415
60.2 Quinazolines .......................................... 415
References ................................................. 416
61 Nucleoside Analogs ......................................... 428
Reference .................................................. 428
62 Dihydropyridines ........................................... 446
63 Arenesulfonamides .......................................... 450
63.1 Antibacterials ........................................ 450
63.2 Diuretics ............................................. 450
Reference .................................................. 451
64 Sulfonylureas .............................................. 462
65 Benzodiazepines ............................................ 466
Reference .................................................. 467
66 Steroids ................................................... 477
References ................................................. 478
67 Anthracyclines ............................................. 492
68 Arylacetic, Benzoic, and Related Carboxylic Acids
(NSAIDS) ................................................... 497
68.1 Salicylates ........................................... 497
References ................................................. 498
69 Quinolonecarboxylic Acids (Cyrase Inhibitors) .............. 514
70 P-Lactams .................................................. 522
70.1 Cephalosporins ........................................ 523
Reference .................................................. 523
71 Prostaglandin Analogs ...................................... 538
72 Sartans .................................................... 543
Reference .................................................. 544
73 Statins .................................................... 548
74 Folic Acid Analogs (Antifolates) ........................... 551
75 Taxanes .................................................... 554
Reference .................................................. 554
76 Macrocyclic Compounds ...................................... 557
Reference .................................................. 557
Index ...................................................... 567
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