title: Assembly-line synthesis of organic molecules with tailored shapes.
abstract: Molecular 'assembly lines', in which organic molecules undergo iterative processes such as chain elongation and functional group manipulation, are found in many natural systems, including polyketide biosynthesis. Here we report the creation of such an assembly line using the iterative, reagent-controlled homologation of a boronic ester. This process relies on the reactivity of α-lithioethyl tri-isopropylbenzoate, which inserts into carbon-boron bonds with exceptionally high fidelity and stereocontrol; each chain-extension step generates a new boronic ester, which is immediately ready for further homologation. We used this method to generate organic molecules that contain ten contiguous, stereochemically defined methyl groups. Several stereoisomers were synthesized and shown to adopt different shapes-helical or linear-depending on the stereochemistry of the methyl groups. This work should facilitate the rational design of molecules with predictable shapes, which could have an impact in areas of molecular sciences in which bespoke molecules are required.
authors.affiliation: School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK.
authors.forename: Matthew
authors.initials: M
authors.lastname: Burns
authors.affiliation: School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK.
authors.forename: Stéphanie
authors.initials: S
authors.lastname: Essafi
authors.affiliation: School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK.
authors.forename: Jessica R
authors.initials: JR
authors.lastname: Bame
authors.affiliation: School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK.
authors.forename: Stephanie P
authors.initials: SP
authors.lastname: Bull
authors.affiliation: School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK.
authors.forename: Matthew P
authors.initials: MP
authors.lastname: Webster
authors.affiliation: School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK.
authors.forename: Sébastien
authors.initials: S
authors.lastname: Balieu
authors.affiliation: Novartis Horsham Research Centre, Wimblehurst Road, Horsham, West Sussex RH13 5AB, UK.
authors.forename: James W
authors.initials: JW
authors.lastname: Dale
authors.affiliation: School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK.
authors.forename: Craig P
authors.initials: CP
authors.lastname: Butts
authors.affiliation: School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK.
authors.forename: Jeremy N
authors.initials: JN
authors.lastname: Harvey
authors.affiliation: School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK.
authors.forename: Varinder K
authors.initials: VK
authors.lastname: Aggarwal
mesh_terms: D060326:Chemistry Techniques, Synthetic / Q000379:methods* / Q000592:standards; D009682:Magnetic Resonance Spectroscopy; D008968:Molecular Conformation; D061065:Polyketides / Q000138:chemical synthesis* / Q000737:chemistry
chemical_list: D061065:Polyketides