Practical Medicinal Chemistry K N Jayaveera S Subramanyam Yogananda Reddy S Chand

167 Pages·2019·6.647 MB·English

by  K N Jayaveera S Subramanyam Yogananda Reddy S Chand

PRACTICAL MEDICINAL CHEMISTRY

PRACTICAL
MEDICINAL CHEMISTRY
Dr. K.N. JAYAVEERA
M.Sc., Ph.D., FIC, FICCP
Professor
Jawaharlal Nehru Technological University, Anantapur
Andhra Pradesh
Dr. S. SUBRAMANYAM
M.Pharm., Ph.D., FICCP
Associate Professor
Bharat Institute of Technology, Pharmacy,
Hyderabad
Andhra Pradesh
Dr. K. YOGANANDA REDDY
M.Sc., Ph.D., FICCP
Scientist
International Science-Tech Research Institute, Anantapur
Andhra Pradesh
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© 2014, Authors
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First Edition 2014
ISBN : 81-219-4245-4 Code : 22 038
PREFACE
This book Practical Medicinal Chemistry is intended for use in undergraduate pharmacy course on
medicinal chemistry where there is a need to appreciate the rationales behind the synthesis of drugs.
It provides a suitable background for graduates in chemistry who are just entering the pharmaceutical
industry. In lecture, they will learn the principles and theories that, to date, best explain the observa-
tions that have accumulated. The problem is that, it is easy to forget that these theories apply to the real
world. The laboratory experience is by design your opportunity to see these principles and theories in
practice. This practical manual has been written not only to enhance students’ understanding of chem-
istry, but also to capture data and take observations. The emphasis in this book is on principles, which
are appropriately illustrated by groups of drugs in current use. This approach should provide the newly
qualified graduates with an understanding of new developments as they take place in future years.
The students of pharmacy will find this book helpful in understanding the basic principles involved
in the synthesis of organic compounds and in analyzing the drug samples. The titrimetric analysis in
this book covers all the basic aspects for undergraduate level students. The book clearly picturizes the
schemes and the reactions involved in the synthetic procedure and the analytical technique. Any sug-
gestions for future improvement of the book are most welcome and will be highly appreciated.
Dr. K.N. Jayaveera
Dr. S. Subramanyam
Dr. K. Yogananda Reddy
Disclaimer : While the authors of this book have made every effort to avoid any mistakes or omissions and have used their skill,
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coincidental and work of imagination. Thus the same should in no manner be termed as defamatory to any individual.

CONTENTS
1. INTRODUCTION 1–27
2. SYNTHESIS OF SOME OFFICIAL MEDICINAL COMPOUNDS 28–75
1. Synthesis of Barbituric Acid from Diethyl Malonate 28
2. Synthesis of Phenytoin from Benzoin 29
3. Synthesis of Paracetamol from P- Amino Phenol 30
4. Synthesis of 1,4- Dihydro Pyridine from Ethyl Acetoacetate 31
5. Synthesis of Quinazolinone from Anthranilic Acid 32
6. Synthesis of Sulfanilamide from Acetanilide 33
7. Synthesis of Isoniazid from Gamma–Picoline 34
8. Synthesis of Antipyrine from Ethylacetoacetate 35
9. Synthesis of Benzocaine from PABA 37
10. Synthesis of 7-Hydroxy- 4-Methyl Coumarin from Resorcinol 40
11. Synthesis of Phensuximide 41
12. Synthesis of Ritodrine 42
13. Synthesis of Indomethacin 44
14. Synthesis of Diclofenac Sodium 47
15. Synthesis of Naproxen 48
16. Synthesis of Aspirin 50
17. Synthesis of Metronidazole 51
18. Synthesis of Niclosamide 52
19. Synthesis of Acyclovir 53
20. Synthesis of Diazoxide 54
21. Synthesis of Busulfan 56
22. Synthesis of Methyldopa 57
23. Synthesis of Etofylline Clofibrate 58
24. Synthesis of Mefenamic Acid 60
25. Synthesis of Benzimidazole from Ortho-Phenylene Diamine 60
26. Synthesis of P-Amino Salicylic Acid from P-Nitro Salicylic Acid 61
27. Synthesis of Dichloramine-T from Toluene P– Sulphonamide 61
28. Synthesis of Chloramine-T 64
29. Synthesis of Fluorescein 66
30. Synthesis of Eosin from Fluorescein 67
31. Synthesis of Sulphacetamide from Sulphanilamide 67
32. Synthesis of Phenothiazine from Diphenylamine 68
33. Synthesis of P-Aminobenzene Sulphonamide(Sulphanilamide) 68
34. Synthesis of Cinnamic Acid 69
35. Synthesis of Benzyl Alcohol by Cannizzaro Reaction 71
36. Synthesis of 1, 1, 1-Trichloro-2-Methyl-2-Propanol (Chlorobutanol) 72
37. Synthesis of 1,2-Naphthoquinone 73
(vii)
(viii)
38. Synthesis of 2, 3–Diphenylquinoxaline 74
39. Synthesis of Benzotriazole 74
40. Synthesis of 2, 4, 5-Tri Phenyl Imidazole 75
3. ASSAY OF SOME OFFICIAL COMPOUNDS 76–103
1. Assay of Sulphamethoxazole 76
2. Assay of Glibenclamide Tablets 78
3. Assay of Metronidazole Tablets 79
4. Assay of Ibuprofen Tablets 80
5. Assay of Frusemide Tablets 81
6. Assay of Isoniazid Tablets 82
7. Assay of Aspirin Tablets 83
8. Assay of Phenytoin Tablets 84
9. Assay of Phenobarbitone Sodium Tablets 85
10. Assay of Salbutamol Tablets 86
11. Assay of Phenyl Butazone Tablets 87
12. Assay of Compound Benzoic Acid Ointment 88
13. Assay of Diethylcarbamazine Citrate Tablets 89
14. Assay of Diclofenac Sodium 89
15. Analgin Tablets by Iodimetry 90
16. Assay of Ephedrine Hydrochloride 90
17. Assay of Benzocaine by Diazotization 91
18. Assay of Chlorpromazine 92
19. Assay of Sulphadiazine 93
20. Assay of Chloroquine 94
21. Assay of Ascorbic Acid 95
22. Assay of Benzylpenicillin Sodium 95
23. Assay of Dapsone Tablets 96
24. Assay of Thiamine Hydrochloride (Vitamin B1) 97
25. Assay of Ampicillin 97
26. Estimation of Alkaloid (by Gravimetry) 98
27. Estimation of Phosphoric Acid 98
28. Estimation of Lactic acid 99
29. Estimation of Salicylic Acid 100
30. Estimation of Ephedrine by Degradation Method 100
31. Estimation of Caffeine 101
32. Determination of Eugenol in Clove Oil 101
33. Volatile Oil Production by Steam Distillation 102
4. MONOGRAPH ANALYSIS OF THE FOLLOWING COMPOUNDS 104–141
1. Acetazolamide 115
2. Aminophylline (Theophylline and Ethylenediamine) 116
3. Ascorbic Acid 118
4. Caffeine 119
5. Sulphacetamide Sodium 120
6. Paracetamol (Acetaminophen) 121
7. Atropine Sulfate 123
8. Aspirin (Acetylsalicylic Acid) 124
9. Isoniazid(Isonicotinylhydrazid; INH) 125
(ix)
10. Phenobarbitone 126
11. Phenytoin Sodium 127
12. Phensuximide 128
13. Ritodrine Hydrochloride 128
14. Benzocaine 130
15. Indomethacin 131
16. Diclofenac Sodium 131
17. Naproxen 132
18. Metronidazole 134
19. Niclosamide 135
20. Aciclovir 136
21. Diazoxide 137
22. Busulfan 138
23. Methyldopa 139
24. Etofylline 140
5. IDENTIFICATION AND ESTIMATION OF DRUG
METABOLITES FROM BIOLOGICAL FLUIDS 142–143
1. Estimation of Diphenyl Hydantoin in Blood or Urine 142
2. Estimation of Diphenhydramine by Acid dye Technique 142
3. Estimation of Barbiturate in Plasma or Urine 143
6. DETERMINATION OF PARTITION COEFFICIENT OF
COMPOUNDS FOR QSAR ANALYSIS 144–146
1. Partition Coefficient for the Distribution of Iodine
between Carbon Tetrachloride and Water 144
2. Partition Coefficient for the Distribution of Phenyl
Butazone between Octanol and Water 145
3. Partition Coefficient for the Distribution of Methyldopa between Octanol and Water 146
7. I.R. SPECTRA OF SOME OFFICIAL MEDICINAL COMPOUNDS 147–156
1. Aspirin 147
2. Phenobarbitone 148
3. Phenytoin 148
4. Ritodrine Hydrochloride 149
5. Naproxen 149
6. Diclofenac 149
7. Paracetamol 150
8. Indomethacin 150
9. Isoniazid 150
10. Metronidazole 151
11. Niclosamide 151
12. Acyclovir 151
13. Diazoxide 152
14. Busulfan 152
15. Methyldopa 152