Stereoselective Synthesis in Organic Chemistry

This monumental tome by Prof. Atta-ur-Rahman and Dr. Zahir Shah pres ents a broad overall perspective of stereo selectivity in the synthesis of or ganic molecules. Thus it treats a problem that is of fundamental importance and will be even more important in the future as the drug industry is required to supply 1000/0 optically pure compounds. After an exposition of general principles, the following subjects are treated: Catalytic Reductions, Heterogeneous Catalytic Hydrogenations, Stereoselective Non-Catalytic Reductions, Stereos elective Carbon-Carbon Bond Forming Reactions, Asymmetric Oxidations, Asymmetric Carbon Heteroatom Bond Formations, Enzyme Catalyzed Reactions, Stereo selective Free Radical Reactions, and finally Miscellaneous Stereoselective Reactions. For each subject, a wealth of examples are given. The highly selective reactions are mentioned along with reactions that are not. This is helpful as it will teach the practical chemist what to avoid. Much progress has been made in the last two decades in the design of new, very stereoselective reactions which can be applied in industry. For example, and in alphabetical order, we can mention (among other peers): H.C. Brown (hydroboration), D.C. Evans (carbon-carbon bond forma tion), R. Noyori (BINAP reagents for hydrogenation), and K.B. Sharpless (epoxidation and dihydroxylation of double bonds). Thus the field has completely changed since the 1950s, when optically pure compounds were always obtained by difficult resolutions of racemates and not by stereoselec tive reactions.

Klappentext

This monumental tome by Prof. Atta-ur-Rahman and Dr. Zahir Shah pres­ ents a broad overall perspective of stereo selectivity in the synthesis of or­ ganic molecules. Thus it treats a problem that is of fundamental importance and will be even more important in the future as the drug industry is required to supply 1000/0 optically pure compounds. After an exposition of general principles, the following subjects are treated: Catalytic Reductions, Heterogeneous Catalytic Hydrogenations, Stereoselective Non-Catalytic Reductions, Stereos elective Carbon-Carbon Bond Forming Reactions, Asymmetric Oxidations, Asymmetric Carbon­ Heteroatom Bond Formations, Enzyme Catalyzed Reactions, Stereo­ selective Free Radical Reactions, and finally Miscellaneous Stereoselective Reactions. For each subject, a wealth of examples are given. The highly selective reactions are mentioned along with reactions that are not. This is helpful as it will teach the practical chemist what to avoid. Much progress has been made in the last two decades in the design of new, very stereoselective reactions which can be applied in industry. For example, and in alphabetical order, we can mention (among other peers): H.C. Brown (hydroboration), D.C. Evans (carbon-carbon bond forma­ tion), R. Noyori (BINAP reagents for hydrogenation), and K.B. Sharpless (epoxidation and dihydroxylation of double bonds). Thus the field has completely changed since the 1950s, when optically pure compounds were always obtained by difficult resolutions of racemates and not by stereoselec­ tive reactions.

Inhalt

1 Stereochemical Principles.- 1.1 Introduction.- 1.2 Chirality.- 1.3 Diastereotopic Groups and Faces.- 1.4 Enantiotopic Groups and Faces.- 1.5 Homotopic Groups and Faces.- 1.6 Homochiral Relationships.- 1.7 Selectivity in Organic Synthesis.- 1.7.1 Chemoselectivity.- 1.7.2 Regioselectivity.- 1.7.3 Diastereoselectivity.- 1.7.4 Enantioselectivity.- 1.7.4.1 Reactions in Presence of Chiral Additives.- 1.7.4.2 Reactions Involving Covalent Linkages of Chiral Auxiliary Groups with Substrates.- 1.7.4.3 Reactions with Chiral Reagents.- 1.7.4.4 Reactions with Enzymes.- 1.8 References.- 2 Stereoselective Catalytic Reductions.- 2.1 Homogeneous Catalytic Hydrogenations.- 2.1.1 Hydrogenation of Olefins.- 2.1.1.1 Hydrogenation with Rh-complexes.- 2.1.1.1.1 Tetrasubstituted Olefins.- 2.1.1.1.2 Substituted Itaconate Esters.- 2.1.1.2 Hydrogenation with Ru-complexes.- 2.1.1.2.1 Allylic and Homoallylic Alcohols.- 2.1.1.2.2 Unsaturated Carboxylic Acids.- 2.1.1.2.3 Dicarboxylic Acids.- 2.1.1.2.4 Dehydroamino Acids.- 2.1.1.2.5 Prochiral Ketones.- 2.1.1.3 Hydrogenation with Ti-complexes.- 2.1.1.4 Hydrogenation with Co-complexes.- 2.1.1.5 Hydrogenation with Heterobimetallic Complexes.- 2.1.2 Catalytic Hydrosilylation.- 2.1.2.1 Catalytic Hydrosilylation of Olefins.- 2.1.2.2 Catalytic Hydrosilylation of Imines.- 2.1.3 Catalytic Hydrogenation of Ketones.- 2.1.3.1 Direct Hydrogenation of Simple Ketones.- 2.1.3.2 Direct Hydrogenation of Functionalized Ketones.- 2.1.3.2.1 With Rhodium-Diphosphine Catalysts.- 2.1.3.2.2 With Ruthenium Complexes.- 2.1.3.2.3 With Copper Complexes.- 2.1.3.3 Hydrogenation of Ketones via Derivatization.- 2.1.3.3.1 Hydrogenation of Simple Ketones via Hydrosilylation.- 2.1.3.3.2 Hydrogenation of Functionalized Ketones via Hydrosilylation.- 2.1.3.3.3 Hydrogenation of Ketones via Enol Phosphinates.- 2.2 Heterogeneous Catalytic Hydrogenations.- 2.2.1 Enantioselective Heterogeneous Catalytic Hydrogenations.- 2.2.2 Diastereoselective Heterogeneous Catalytic Hydrogenations.- 2.2.2.1 Asymmetric Hydrogenation of Carbon-Carbon Double Bonds.- 2.2.2.1.1 Hydrogenation of N-Acyl-?,ß-Dehydroamino Acids.- 2.2.2.1.2 Asymmetric Hydrogenation of Cyclic Dehydropeptides.- 2.2.2.2 Asymmetric Hydrogenation of other Carbonyl Compounds.- 2.2.2.2.1 Asymmetric Hydrogenation of Benzoylformic Acid Esters.- 2.2.2.2.2 Asymmetric Hydrogenation of ?-Keto Amides.- 2.2.2.3 Asymmetric Hydrogenation of Carbon-Nitrogen Double Bonds.- 2.2.2.3.1 Hydrogenation of Imines, Oximes and Hydrazones.- 2.3 References.- 3 Stereoselective Non-Catalytic Reductions.- 3.1 Enantioselective Non-Catalytic Reductions.- 3.1.1 Chiral Metal-hydride Complexes.- 3.1.1.1 Lithium Aluminium Hydride Modified with Chiral Groups.- 3.1.1.1.1 LAH Modified with Alcohols.- 3.1.1.1.2 LAH Modified with Amino Alcohols.- 3.1.1.2 Chiral Boranes and Borohydrides.- 3.1.1.2.1 Chiral Alkylboranes.- 3.1.1.2.2 Chiral Borohydride Reagents.- 3.1.1.2.2.1 NaBH4-derived Reagents.- 3.1.1.2.2.1.1 Phase Transfer Catalyzed Reductions.- 3.1.1.2.2.1.2 LiBH4 Reductions.- 3.1.1.2.2.2 Super Hydrides.- 3.1.2 Chiral Metal Alkyls and Alkoxides.- 3.1.3 Chiral Dihydropyridine Reagents.- 3.2 Diastereoselective Non-Catalytic Reductions.- 3.2.1 Cyclic Substrates.- 3.2.2 Acyclic Substrates.- 3.2.2.1 1, 2- Induction.- 3.2.2.2 1,3-, 1,4- and 1,6- Inductions.- 3.2.2.2.1 Cyclic Ketones.- 3.3 References.- 4 Stereoselective Carbon-Carbon Bond Forming Reactions.- 4.1 Nucleophilic Additions to Aldehydes and Ketones.- 4.1.1 Enantioselective Addition Reactions.- 4.1.2 Diastereoselective Addition Reactions.- 4.1.2.1 Diastereoselective Additions to Carbonyl Compounds.- 4.1.2.2 Diastereoselective Additions to Cyclic Ketones.- 4.1.3 Addition of Chiral Reagents.- 4.1.4 Stereoselectivity of Nucleophilic Addition Reactions.- 4.2 Asymmetric Catalytic Hydrocarbonylations.- 4.2.1 Asymmetric Hydroformylations.- 4.2.1.1 Asymmetric Hydroformylation with Homogeneous Catalysts.- 4.2.1.2 Asymmetric Hydroformylations with Heterogeneous Catalysts.- 4.2.2 Asymmetric Hydroesterification.- 4.3 Asymmetric Aldol Reactions.- 4.3.1 Stereochemistry of the Aldol Reaction.- 4.3.1.1 Transition State Models in the Aldol Reaction.- 4.3.2 Addition of Enolates to Achiral Aldehydes.- 4.3.2.1 Generation and Aldol Reactions of Enolates.- 4.3.2.1.1 Li Enolates in Aldol Reactions.- 4.3.2.1.1.1 Ketone Enolates.- 4.3.2.1.1.2 Ester and Lactone Enolates.- 4.3.2.1.1.3 Amide and Lactam Enolates.- 4.3.2.1.1.4 Thioester and Thioamide Enolates.- 4.3.2.1.1.5 Carboxylic Acid Dianions.- 4.3.2.1.2 Boron Enolates in Aldol Reactions.- 4.3.2.1.3. Magnesium Enolates in Aldol Reactions.- 4.3.2.1.4 Titanium Enolates in Aldol Reactions.- 4.3.2.1.5 Zinc Enolates in Aldol Reactions.- 4.3.2.1.6 Tin Enolates in Aldol Reactions.- 4.3.2.1.7 Silicon Enolates in Aldol Reactions.- 4.3.2.1.8 Zirconium Enolates in Aldol Reacti…