Controlling Chemoselectivity of Catalytic Hydroboration with Light
作者:Enrico Bergamaschi、Danijela Lunic、Liam A. McLean、Melissa Hohenadel、Yi‐Kai Chen、Christopher J. Teskey
DOI:10.1002/anie.202114482
日期:2022.2.14
Light-controllable, chemoselective hydroboration of ketoacids is reported using a well-defined cobalt hydride catalyst. Excellent selectivities can be achieved, with acids reacting in the dark and ketones in the light. This approach can be further extended to other functional groups.
Hydroxyarylketones via Ring-Opening of Lactones with Aryllithium Reagents: An Expedient Synthesis of (±)-Anabasamine
作者:Mark Trudell、Lei Miao、Stassi DiMaggio
DOI:10.1055/s-0029-1217047
日期:2010.1
The regioselective ring-opening of lactones (δ-valerolactone and γ-butyrolactone) with aryllithium reagents is reported for the construction of a series of δ-hydroxy aryl ketones and γ-hydroxy aryl ketones. Application of this method for the expeditious syntheses of (±)-anabasamine and its nicotine-related analogue are also described.
Enantioselective Synthesis of 2,6-<i>cis</i>-Disubstituted Tetrahydropyrans via a Tandem Catalytic Asymmetric Hydrogenation/Oxa-Michael Cyclization: An Efficient Approach to (−)-Centrolobine
A highly efficient one-pot process via a tandemreaction of catalytic asymmetric hydrogenation and oxa-Michael cyclization for the synthesis of 2,6-cis-disubstituted tetrahydropyrans has been developed (ee up to 99.9%, cis/trans-selectivity up to 99:1). This method provides a concise route to (−)-centrolobine (68.8% yield, three steps).
Enantioselective Ketone Hydroacylation Using Noyori’s Transfer Hydrogenation Catalyst
作者:Stephen K. Murphy、Vy M. Dong
DOI:10.1021/ja4021974
日期:2013.4.17
An enantioselectiveketone hydroacylation enables the direct preparation of lactones from keto alcohols. The alcohol is oxidized in situ to an aldehyde, obviating the need to prepare sensitive keto aldehyde substrates. Noyori's asymmetric transferhydrogenationcatalyst was applied to address challenges of reactivity, chemoselectivity, and enantioselectivity.