transfer hydrogenation and borrowinghydrogen reactions paved the way to manipulate simple alcohols in previously unthinkable manners and circumvented the need for hydrogen gas. Analogously, transfer hydrocarbylation could greatly increase the versatility of tertiary alcohols. However, this reaction remains unexplored because of the challenges associated with the catalytic cleavage of unactivated C–C bonds
Continuous Flow Synthesis of Ketones from Carbon Dioxide and Organolithium or Grignard Reagents
作者:Jie Wu、Xiaoqing Yang、Zhi He、Xianwen Mao、T. Alan Hatton、Timothy F. Jamison
DOI:10.1002/anie.201405014
日期:2014.8.4
describe an efficient continuousflowsynthesis of ketones from CO2 and organolithium or Grignard reagents that exhibits significant advantages over conventional batch conditions in suppressing undesired symmetric ketone and tertiary alcohol byproducts. We observed an unprecedented solvent‐dependence of the organolithium reactivity, the key factor in governing selectivity during the flow process. A facile
Dynamic kinetic resolution of bis-aryl succinic anhydrides: enantioselective synthesis of densely functionalised γ-butyrolactones
作者:Romain Claveau、Brendan Twamley、Stephen J. Connon
DOI:10.1039/c8cc00609a
日期:——
The efficient Dynamic Kinetic Resolution (DKR) of disubstituted anhydrides has been shown to be possible for the first time. Using an ad hoc designed organocatalyst and an enantio- and diastereoselective cycloaddition process with aldehydes, stereochemically complex γ-butyrolactone derivatives can be obtained – with control over three contiguous stereocentres, one of which is all carbon quaternary
Carbonation of ortho-, meta- and para-trifluoromethylphenyllithium compounds
作者:Edward J. Soloski、Christ Tamborski
DOI:10.1016/s0022-328x(00)94019-1
日期:1978.9
The three isomeric trifluoromethylphenyllithium compounds were carbonated under different conditions and the resulting products, acids, ketones and alcohols were isolated. The metalation of trifluoromethylbenzene with n-C4H9Li/TMEDA is also described.
在不同条件下将三种异构的三氟甲基苯基锂化合物碳酸盐化,分离出生成的产物,酸,酮和醇。还描述了三氟甲基苯与nC 4 H 9 Li / TMEDA的金属化。
The base-catalysed Tamura cycloaddition reaction: calculation, mechanism, isolation of intermediates and asymmetric catalysis
investigation has revealed that the base-catalysed Tamura cycloaddition between homophthalic anhydride and activated alkenes/alkynes – a reaction previously thought of as a Diels–Alder type process – proceeds via a stepwise mechanism involving conjugate addition and ring closure; which allowed the first catalytic asymmetric α-substitution reactions to be demonstrated with up to >99% ee.