Telaprevir fragments as organocatalysts in asymmetric direct aldol reactions of aldehydes
摘要:
We have demonstrated that the fragments of Telaprevir can act as organocatalysts for asymmetric aldol reactions between aromatic aldehydes and acetone under mild conditions. The reaction conditions have been optimized in terms of the catalyst nature, choice of temperature, solvent, additive, and the catalyst loading. Under proper conditions, fairly good yield and enantioselectivity have been achieved.
Enantioselective Biocatalytic Oxidative Desymmetrization of Substituted Pyrrolidines
作者:Valentin Köhler、Kevin R. Bailey、Anass Znabet、James Raftery、Madeleine Helliwell、Nicholas J. Turner
DOI:10.1002/anie.200906655
日期:2010.3.15
Made up out of air: The highly enantioselectiveoxidation of 3,4‐substituted meso‐pyrrolidines to Δ1‐pyrrolines is reported. The reaction is catalyzed by monoamine oxidase from Aspergillus niger (MAO‐N D5) and utilizes molecular oxygen from air as the stoichiometric oxidant. The corresponding Δ1‐pyrrolines serve as useful building blocks for the synthesis of L‐proline analogues and α‐amino nitriles