Practical, Broadly Applicable, α-Selective, <i>Z</i>-Selective, Diastereoselective, and Enantioselective Addition of Allylboron Compounds to Mono-, Di-, Tri-, and Polyfluoroalkyl Ketones
作者:Farid W. van der Mei、Changming Qin、Ryan J. Morrison、Amir H. Hoveyda
DOI:10.1021/jacs.7b05011
日期:2017.7.5
accessible unsaturated organoboron compounds serve as reagents. Transformations were performed with 0.5-2.5 mol % of a boron-based catalyst, generated in situ from a readily accessible valine-derived aminophenol and a Z- or an E-γ-substituted boronic acid pinacol ester. With a Z organoboron reagent, additions to trifluoromethyl and polyfluoroalkyl ketones proceeded in 80-98% yield, 97:3 to >98:2 α:γ selectivity
Catalytic enantioselective addition of organoboron reagents to fluoroketones controlled by electrostatic interactions
作者:KyungA Lee、Daniel L. Silverio、Sebastian Torker、Daniel W. Robbins、Fredrik Haeffner、Farid W. van der Mei、Amir H. Hoveyda
DOI:10.1038/nchem.2523
日期:2016.8
Organofluorine compounds are central to modern chemistry, and broadly applicable transformations that generate them efficiently and enantioselectively are in much demand. Here we introduce efficient catalytic methods for the addition of allyl and allenyl organoboron reagents to fluorine-substituted ketones. These reactions are facilitated by readily and inexpensively available catalysts and deliver versatile
Electronically Activated Organoboron Catalysts for Enantioselective Propargyl Addition to Trifluoromethyl Ketones
作者:Nicholas W. Mszar、Malte S. Mikus、Sebastian Torker、Fredrik Haeffner、Amir H. Hoveyda
DOI:10.1002/anie.201703844
日期:2017.7.17
A broadly applicable, practical, scalable, efficient and highly α‐ and enantioselective method for addition of a silyl‐protected propargyl moiety to trifluoromethylketones has been developed. Reactions, promoted by 2.0 mol % of a catalyst that is derived in situ from a readily accessible aminophenol compound at ambient temperature, were complete after only 15 minutes at room temperature. The desired
1-heteroazolyl-1-heterocyclyl alkane derivatives and their use and their
申请人:Astra Aktiebolag
公开号:US05607956A1
公开(公告)日:1997-03-04
The present invention relates to novel heterocyclic compounds having the general formula (1) ##STR1## geometric and optical isomers and racemates thereof where such isomers exist, as well as pharmaceutically acceptable acid addition salts thereof and solvates thereof; having therapeutic activity, processes and intermediates for their preparation, pharmaceutical formulations containing said compounds and the medicinal use of said compounds.