title: Catalytic use of indium(0) for carbon-carbon bond transformations in water: general catalytic allylations of ketones with allylboronates.
abstract: We have discovered the unprecedented catalytic use of In(0) for catalytic C-C bond transformations. Remarkably, these general catalytic allylations of ketones proceeded smoothly in water as a sole solvent under mild conditions, and water proved to be essential for these reactions. Both the displayed substrate scope and the functional group tolerance were excellent. Importantly, the In metal catalyst could be easily recovered and reused without loss of catalytic activity. Moreover, when an alpha-substituted allylboronate was used, an unusual constitutional selectivity was observed providing exclusively the formal alpha-adduct. Additionally, the resulting tertiary homoallylic alcohols were obtained with exceptionally high diastereoselectivities. The applicability of this concept to asymmetric catalysis in water by using In(0) combined with a chiral bis(oxazoline) ligand was demonstrated as well.
authors.affiliation: Department of Chemistry, School of Science and Graduate School of Pharmaceutical Sciences, The University of Tokyo, The HFRE Division, ERATO, JST, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
authors.forename: Uwe
authors.initials: U
authors.lastname: Schneider
authors.forename: Masaharu
authors.initials: M
authors.lastname: Ueno
authors.forename: Shū
authors.initials: S
authors.lastname: Kobayashi
mesh_terms: D000438:Alcohols / Q000138:chemical synthesis* / Q000737:chemistry; D000478:Alkylation; D000498:Allyl Compounds / Q000737:chemistry*; D001897:Boronic Acids / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry*; D002384:Catalysis; D007204:Indium / Q000737:chemistry*; D007659:Ketones / Q000737:chemistry*; D015394:Molecular Structure; D013237:Stereoisomerism; D014867:Water / Q000737:chemistry
chemical_list: D000438:Alcohols; D000498:Allyl Compounds; D001897:Boronic Acids; D007659:Ketones; D007204:Indium; D014867:Water; D002244:Carbon