Transition Metal-Catalyzed Couplings in Process Chemistry (eBook)

Javier Magano was born in Madrid, Spain. He received a B.S. in organic chemistry from Complutense University in Madrid in 1987 and a M.Sc. degree in chemistry from the University of Michigan in 1990. After working for the oil industry in Spain for several years, he obtained a M.Sc. degree in rubber and polymer science at the Center for Advanced Scientific Research in Madrid. After moving back to the United States, he joined the early process chemistry group at Pfizer in 1998 in Ann Arbor, MI, where he spent nine years developing scalable processes for the preparation of drug candidates. In 2007, he moved to Groton, CT to continue his work as a process chemist and, during this period, he has also worked in the area of biologics for 1.5 years on the preparation of linkers for bioconjugation processes. Javier currently holds a position in the Chemical Technology group at Pfizer, where he is involved in the applications of high-throughput screening to transition metal-catalyzed couplings. His research interests also include the development of catalytic processes that employ non-precious metals in coupling reactions. Joshua R. Dunetz graduated from Haverford College in 2000 with a B.A. in Chemistry after undergraduate research with Professor Karin Åkerfeldt. He received his Ph.D. in Organic Chemistry from MIT in 2005 under the guidance of Professor Rick Danheiser, and then completed postdoctoral studies with Professor William Roush at Scripps Florida. In early 2008, Joshua assumed his current position with Pfizer Chemical R&D in which he develops processes for the GMP manufacture of small molecules on gram to multikilogram scale.

FOREWORD 1
FOREWORD 2
FOREWORD 3

INTRODUCTION

COPPER-CATALYZED COUPLING FOR A GREEN PROCESS
Introduction
Synthesis of Amino Acid 14
Copper-Catalyzed Cyclization
Sustainability
Summary

EXPERIENCES WITH NEGISHI COUPLINGS ON TECHNICAL SCALE IN EARLY DEVELOPMENT
Introduction
Synthesis of LBT613 via Pd-Catalyzed Negishi Coupling
Elaboration of a Negishi Coupling in the Synthesis of PDE472
Ni-Catalyzed Negishi Coupling with Catalytic Amounts of ZnCl2
Conclusions

DEVELOPING PALLADIUM-CATALYZED ARYLATIONS OF CARBONYL-ACTIVATED C - H BONDS
Introduction
Suzuki Approach to Side Chain Installation
Arylation of Carbonyl-Activated C - H Bonds
Pd Purging from API
Conclusions

DEVELOPMENT OF A PRACTICAL SYNTHESIS OF NAPHTHYRIDONE P38 MAP KINASE INHIBITOR MK-0913
Introduction
Medicinal Chemistry Approach to 1
Results and Discussion
Conclusions

PRACTICAL SYNTHESIS OF A CATHEPSIN S INHIBITOR
Introduction
Synthetic Strategy
Syntheses of Building Blocks
Sonogashira Coupling and Initial Purification of 1
Salt Selection
Conclusions

C - N COUPLING CHEMISTRY AS A MEANS TO ACHIEVE A COMPLICATED MOLECULAR ARCHITECTURE: THE AR-A2 CASE STORY
A Novel Chemical Entity
Evaluation of Synthetic Pathways: Finding the Best Route
Enabling C - N Coupling by Defining the Reaction Space
From Synthesis to Process
Concluding Remarks

PROCESS DEVELOPMENT AND SCALE-UP OF PF-03941275, A NOVEL ANTIBIOTIC
Introduction
Medicinal Chemistry Synthesis of PF-03941275
Synthesis of 5-Bromo-2,4-difluorobenzaldehyde (1)
Synthesis of Amine 3
Miyaura Borylation Reaction
Suzuki - Miyaura Coupling
Barbituric Acid Coupling
Chlorination and API Isolation
Conclusions

DEVELOPMENT OF A PRACTICAL NEGISHI COUPLING PROCESS FOR THE MANUFACTURING OF BILB 1941, AN HCV POLYMERASE INHIBITOR
Introduction and Background
Stille Coupling
Suzuki Coupling
Negishi Coupling
Comparison of Three Coupling Processes

APPLICATION OF A RHODIUM-CATALYZED, ASYMMETRIC 1,4-ADDITION TO THE KILOGRAM-SCALE MANUFACTURE OF A PHARMACEUTICAL INTERMEDIATE
Introduction
Early Development
Process Optimization
Process Scale-up
Recent Developments
Conclusions

COPPER-CATALYZED C - N COUPLING ON LARGE SCALE: AN INDUSTRIAL CASE STUDY
Introduction
Process Development of the C - N Bond Formation
Choice of Catalytic System
Choice of Base: Inorganic Versus Organic
Choice of Solvent
Optimized Conditions for C - N Bond Formation to 1
Purging Residual Copper from 1
Conclusions

DEVELOPMENT OF A HIGHLY EFFICIENT REGIO- AND STEREOSELECTIVE HECK REACTION FOR THE LARGE-SCALE MANUFACTURE OF AN A4B2 NNR AGONIST
Introduction
Process Optimization
Conclusions

COMMERCIAL DEVELOPMENT OF AXITINIB (AG-013736): OPTIMIZATION OF A CONVERGENT PD-CATALYZED COUPLING ASSEMBLY AND SOLID FORM CHALLENGES
Introduction
First-Generation Synthesis of Axitinib
Early Process Research and Development
Commercial Route Development
Conclusions

LARGE-SCALE SONOGASHIRA COUPLING FOR THE SYNTHESIS OF AN MGLUR5 NEGATIVE ALLOSTERIC MODULATOR
Introduction
Background
Process Development of the Sonogashira Coupling
Large-Scale Sonogashira Coupling and API Purification
Conclusions

PALLADIUM-CATALYZED BISALLYLATION OF ERYTHROMYCIN DERIVATIVES
Introduction
Discovery of 6,11-O,O-Bisallylation of Erythromycin Derivatives
Process Development of 6,11-O,O-Bisallylation of Erythromycin Derivatives
Discovery and Optimization of 3,6-Bicyclolides
Conclusions

ROUTE SELECTION AND PROCESS DEVELOPMENT FOR THE VANILLOID RECEPTOR-1 ANTAGONIST AMG 517
Introduction
Retrosynthesis and Medicinal Chemistry Route
Optimization of Medicinal Chemistry Route
Identification of the Process Chemistry Route
Optimization of the Suzuki - Miyaura Reaction
Postcampaign Improvements
Summary

TRANSITION METAL-CATALYZED COUPLING REACTIONS IN THE SYNTHESIS OF TARANABANT: FROM INCEPTION TO PILOT IMPLEMENTATION
Introduction
Development of Pd-Catalyzed Cyanations
Development of Pd-Catalyzed Amidation Reactions
Conclusio