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Publié par | universitat_rostock |
Publié le | 01 janvier 2010 |
Nombre de lectures | 68 |
Langue | English |
Poids de l'ouvrage | 2 Mo |
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Synthesis of Sterically Encumbered Biaryls by [3+3]
Cyclocondensation Reactions and Synthesis of Arylated Pyrazoles,
Bis(diaryl)sulfones, and Bis(alkenyl)pyridines by Pd(0)-Catalysed
Cross-Coupling Reactions
DISSERTATION
zur
Erlangung des akademischen Grades
doctor rerum naturalium (Dr. rer. nat.)
der Mathematisch-Naturwissenschaftlichen Fakultät
der Universität Rostock
vorgelegt von
Asad Ali geb. am 20.02.1982 in Takht Bhai Mardan
aus Pakistan
Rostock, June 2010
urn:nbn:de:gbv:28-diss2010-0156-3
1
Dekan : Prof, Dr Hendrick Schubert
1. Gutachter: Prof Dr Andreas Kirschning
University of Hannover, Germany
2. Gutachter: Prof. Dr Peter Langer,
Institut für Chemie, Albert Einstein Str.3a,
8059 Rostock, Germany
Tag der Promotion: 12.10.2010 .
2
Affectionately dedicated to
My parents, sweet brothers and
sisters.
3
CONTENTS
Declaration / Erklärung 2
Acknowledgements 7
Abbreviations 8
General Introduction 9
Summary 11
4
Synthesis of Sterically Encumbered Biaryls by [3+3] Cyclocondensation
Reactions and Synthesis of Arylated Pyrazoles, Bis(diaryl)sulfones, and
Bis(alkenyl)pyridines by Pd(0)-Catalysed Cross-Coupling Reactions
0 General introduction 09
1. Synthesis of sterically encumbered biaryls based on a Cu(I)–catalysed 12
arylation / [3+3] cylocondensation strategy
1.1 Introduction 12
1.2 Results and discussion 13
1.3 Conclusions 18
2. Synthesis of arylated pyrazoles by site-selective Suzuki- 21
Miyaura reactions of tribromopyrazoles
2.1 Introduction to palladium(0)-catalyzed reactions 19
2.2 Introduction to pyrazole syntheses 21
2.3 Results and discussion 21
2.4 Conclusions 26
3. Synthesis of bis(diaryl)sulfones by Suzuki-Miyaura
reactions of 2,4 -bis(trifluorosulfonyloxy)biphenyl sulfone 27
3.1 Introduction 27
3.2 Results and discussion 27
3.3 Conclusions 30
4. First double Heck cross-coupling reactions of dibrominated
pyridines 31
4.1 Introduction 31
4.2 Results and discussion 32
4.3 Conclusions 37
5. Abstract 38
56. Experimental Section 43
6.1 General: Equipment, chemicals and work technique 43
6.2 Procedures and spectroscopic data 46
References 84
Data for x-ray structures 93
6ACKNOWLEDGEMENTS
By the grace of Allah, the Almighty, the creator of universe, who granted
Hidayah to the mankind and peace and blessings be upon his prophet, Hazrat
Muhammad (Peace be upon Him), who exhorted his followers to seek
knowledge from cradle to grave, I've been able to complete this academic
enterprise.
It is my first and foremost obligation to express my sincere gratitude
from the core of my heart to Professor Dr. Peter Langer my supervisor. His
proper supervision, experience, time devotion and keen interest enable me to
accumulate this humble work.
I ought to submit my thanks to my dear friends, who remembered me in
their prayers and heart. I wish to acknowledge support and encouragement
provided by Muhammad Qasim Naeen, Asif Khan, Jamil Ahmad, Amir, Wajid
Khan, Muhammad Usman and Dr Mukhtar Ullah.
I am thankful to all my past and present colleagues, Ihsan Ullah Marwat,
Alina Bunescu, Thomas Rhan, Inam Iqbal, Muhammad Imran, Majid Riahi,
Rasheed Ahmad, , Olomide, Togam, Muhammad Nawaz, Muhammad Sharif,
Muhammad Zeeshan, Obaid‐Ur‐Rahman, Javana Tatar, Farooq Ebad, and
Mohanad Shkoor for their support encouragement and help to pursue this
work and all others whom I have missed here do deserve equal credit.
Thanks also go to Dr. Martin Hein, Dr Alexander Villinger and all
members of technical sections (NMR, IR, MS, EA and X‐Ray etc) of Rostock
University.
Finally I express my heartiest gratitude and respect to my mother, father
sweet brothers, Sisters and all family who encouraged me through‐out my
studies and supported me what and whenever they could. May God provide me
the way to fulfill their promises? Special thanks to my dear Atia Shams for her
prayers and moral support.
7 Abbreviations
Ar Aromatic
APT Attached Proton Test
ATCC American Type Culture Collection
nBuLi n-Butyl lithium
DEPT Distortion less Enhancement by Polarisation Transfer
EI Electronic Impact
ESI Electro spray Ionization
EtOAc Ethyl acetate
HRMS High Resolution Mass Spectroscopy
IR Infrared Spectroscopy
LDA Lithium Diisopropylamide
MS Mass Spectrometry
Ph Phenyl
NEt Triethylamine 3
NMR Nuclear Magnetic Resonance
HMQC Heteronuclear Multiple Quantum Coherence
HMBC Heteronuclear Multiple Bond Correlation
COSY Correlated Spectroscopy
NOESY Nuclear Over Hauser and Exchange Spectroscopy
MeSiOTf Trimethylsilyl-trifluoromethanesulfonate 3
MeSiCl ethylsilylchloride 3
Mp Melting Point
RCM Ring Closing Metathesis
TBAI Tetra butyl Ammonium Iodide
TFA Trifluoroacetic Acid
TfO Trifluoromethanesulfonic Anhydride 2
THF Tetrahydrofurane
TLC Thin Layer Chromatography
TMS Trimethylsilane
UV Ultraviolet spectroscopy
80. General Introduction and Task of the Thesis
The main focus of chemists is to synthesize both natural products and compounds that do not exist in
nature and to study their physical, chemical and biological properties. This is accompanied by a deep
u