Direct Ruthenium-Catalyzed C−C Coupling of Ethanol: Diene Hydro-hydroxyethylation To Form All-Carbon Quaternary Centers
作者:Hoon Han、Michael J. Krische
DOI:10.1021/ol101077v
日期:2010.6.18
Under ruthenium-catalyzed transfer hydrogenation conditions, direct C−C coupling of ethanol and 2-substituted dienes occurs to furnish products of hydro-hydroxyethylation: anti-configured neopentyl homoallylic alcohols. Identical adducts are generated from acetaldehyde under related conditions employing isopropanol as reductant.
Enantioselective Formation of All-Carbon Quaternary Centers via C–H Functionalization of Methanol: Iridium-Catalyzed Diene Hydrohydroxymethylation
作者:Khoa D. Nguyen、Daniel Herkommer、Michael J. Krische
DOI:10.1021/jacs.6b09333
日期:2016.11.2
enantioselective C-C couplings of methanol (>30 × 106 tons/year) are reported. Insertion of 2-substituted dienes into the methanol C-H bond occurs in a regioselective manner to form all-carbon quaternarycenters with excellent levels of enantioselectivity using an iridium-PhanePhos catalyst. Mechanistic studies corroborate a Curtin-Hammett scenario in which methanol dehydrogenation triggers rapid, reversible