Chiral pyridinium phosphoramide 1·HX was designed to be a new class of chiral Brønsted acid catalyst in which both the pyridinium proton and the adjacent imide-like proton activated by the electron-withdrawing pyridinium moiety could work cooperatively as strong dual proton donors. The potential of 1·HX was shown in the enantioselectiveDiels–Alder reactions of 1-amino dienes with various dienophiles
A highly stereoselective catalytic alkylation sequence for the synthesis of highly functionalized and versatile five-membered-ring compounds bearing all-carbon quaternary stereocenters was developed. Enantioselective desymmetrization of achiral cyclopentene-1,3-diones was thus executed by chiral Cu-phosphoramidite catalysts. A variety of complicated cyclopentane derivatives can be synthesized with
Predicting Highly Enantioselective Catalysts Using Tunable Fragment Descriptors**
作者:Nobuya Tsuji、Pavel Sidorov、Chendan Zhu、Yuuya Nagata、Timur Gimadiev、Alexandre Varnek、Benjamin List
DOI:10.1002/anie.202218659
日期:2023.3.6
Fast and robust predictive models using flexible 2D fragmentdescriptors, particularly suited for asymmetric catalysis, are described. From training data with only moderate selectivities, highlyenantioselectivecatalysts were predicted and validated, enabling a catalytic asymmetric construction of 2,2-disubstituted tetrahydropyrans.
A dramatic improvement of our previous methodology based on a Suzuki-Miyaura cross-coupling to access 3,3'-disubstituted H-8-BINOLs using microwave heating is reported herein. These new conditions represent a large gain in term of atom-economy, reaction time, catalyst loading, and excess of reagents employed. (C) 2014 Elsevier Ltd. All rights reserved.