perform as an efficient heterogeneous catalyst for the synthesis of useful organoboron compounds. Desired β-borylation products were all obtained in good to excellent yields under mild conditions. This catalyst could be recovered easily and still work effectively in six runs. Notably, asymmetric synthesis of organoboron compounds was accomplished by applying a chiral phosphine ligand. This newly developed
A New Microwave-Assisted Organocatalytic Solvent-Free Synthesis of Optically Enriched Michael Adducts
作者:Antonio Procopio、Antonio De Nino、Monica Nardi、Manuela Oliverio、Rossella Paonessa、Raffaele Pasceri
DOI:10.1055/s-0030-1258126
日期:2010.7
A high-yielding reaction protocol for the microwave-assisted organocatalytic conjugate addition of diethyl malonate to enones under solvent-free conditions is proposed. The method still permits the use of cheap and commercially available L -proline furnishing very good performance at least in the case of 1-alkyl-3-monosubstituted enones.
Construction of β to carbonyl stereogenic centres by asymmetric 1,4-addition of alkylzirconocenes to dienones and ynenones
作者:Zhenbo Gao、Stephen P. Fletcher
DOI:10.1039/c8cc01201f
日期:——
A new asymmetric addition of alkylzirconium species to dienones, a dienthioate, ynenones, and ynethionates with good yields and excellent ee's is reported.