Lessons from nature: biomimetic organocatalytic carbon-carbon bond formations.
Nature utilizes simple C2 and C3 building blocks, such as dihydroxyacetone phosphate (DHAP), phosphoenolpyruvate (PEP), and the "active aldehyde" in various enzyme-catalyzed carbon-carbon bond formations to efficiently build up complex organic molecules. In this Perspective, we describe the transition from using enantiopure chemical synthetic equivalents of these building blocks, employing our SAMP/RAMP hydrazone methodology and metalated chiral alpha-amino nitriles, to the asymmetric organocatalytic versions developed in our laboratory. Following this biomimetic strategy, the DHAP equivalent 2,2-dimethyl-1,3-dioxan-5-one (dioxanone) has been used in the proline-catalyzed synthesis of carbohydrates, aminosugars, carbasugars, polyoxamic acid, and various sphingosines. Proline-catalyzed aldol reactions involving a PEP-like equivalent have also allowed for the asymmetric synthesis of ulosonic acid precursors. By mimicking the "active aldehyde" nucleophilic acylations in Nature catalyzed by the thiamine-dependent enzyme, transketolase, enantioselective N-heterocyclic carbene-catalyzed benzoin and Stetter reactions have been developed. Finally, based on Nature's use of domino reactions to convert simple building blocks into complex and highly functionalized molecules, we report on our development of biomimetic asymmetric multicomponent domino reactions which couple enamine and iminium catalysis.
Enders
Dieter
D
Institut für Organische Chemie, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany. enders@rwth-aachen.de
Narine
Arun A
AA
D000596:Amino Acids / Q000737:chemistry; D032701:Biomimetics; D002241:Carbohydrates / Q000138:chemical synthesis; D002244:Carbon / Q000737:chemistry*; D002384:Catalysis; D002625:Chemistry, Organic / Q000379:methods; D004098:Dihydroxyacetone / Q000737:chemistry; D008697:Methane / Q000031:analogs & derivatives / Q000737:chemistry; D008958:Models, Molecular; D009930:Organic Chemicals / Q000138:chemical synthesis*; D010728:Phosphoenolpyruvate / Q000737:chemistry; D013237:Stereoisomerism; D013400:Sugar Acids / Q000737:chemistry; D014174:Transketolase / Q000737:chemistry
D000596:Amino Acids; D002241:Carbohydrates; D009930:Organic Chemicals; D013400:Sugar Acids; C529752:polyoxamic acid; C030011:carbene; D010728:Phosphoenolpyruvate; D002244:Carbon; D014174:Transketolase; D004098:Dihydroxyacetone; D008697:Methane