Concise Synthesis of Potassium Acyltrifluoroborates from Aldehydes through Copper(I)‐Catalyzed Borylation/Oxidation
作者:Jumpei Taguchi、Takumi Takeuchi、Rina Takahashi、Fabio Masero、Hajime Ito
DOI:10.1002/anie.201901748
日期:2019.5.27
subsequent oxidation. This synthetic route is characterized by the wide range of aldehydes accessible, favorable step economy, mild reaction conditions, and tolerance of various functionalgroups, and it enables the facile generation of a range of KATs, for example, bearing halide, sulfide, acetal, or ester moieties. Moreover, this method was applied to the three‐step synthesis of various α‐aminoacid analogues
reactivities. However, the synthesis of these compounds remains mostly complicated and time-consuming. Herein, we have developed chemoselectivePd-catalyzed approaches for the late-stage diversification of arenes bearing prefunctionalized KATs. These approaches feature chemoselectivecross-coupling, rapid diversification, functional group tolerance, mild reaction conditions, simple operation, and high yields
A Reagent for the One-Step Preparation of Potassium Acyltrifluoroborates (KATs) from Aryl- and Heteroarylhalides
作者:Gábor Erős、Yo Kushida、Jeffrey W. Bode
DOI:10.1002/anie.201403931
日期:2014.7.14
design and synthesis of a new reagent for their one‐step preparation from aryl‐ and heteroarylhalides. The reagent is a stable, soluble zwitterion prepared by S‐alkylation of a novel thioformamide trifluoroboronate. The KATs are prepared by adding one equivalent of nBuLi to a mixture of the aryl halide and the reagent at −78 °C. This protocol is suitable for the preparation of KATs containing pyridines
Catalytic Synthesis of Potassium Acyltrifluoroborates (KATs) from Boronic Acids and the Thioimidate KAT Transfer Reagent
作者:Anne Schuhmacher、Sarah J. Ryan、Jeffrey W. Bode
DOI:10.1002/anie.202014581
日期:2021.2.19
synthesis of potassium acyltrifluoroborates (KATs) by a palladium‐catalyzed cross‐coupling of boronic acids and the thioimidate KAT transfer reagent. The combination of widely available aryl‐ and vinylboronic acids with commercially available thioimidate 1 using catalytic PdII and a CuII additive enables the preparation of KATs in high yields and with good functional group tolerance. This formal insertion
Facile synthesis of α-aminoboronic acids from amines and potassium acyltrifluoroborates (KATs)<i>via</i>trifluoroborate-iminiums (TIMs)
作者:Tomoya Shiro、Anne Schuhmacher、Moritz K. Jackl、Jeffrey W. Bode
DOI:10.1039/c8sc01486h
日期:——
We report the facile formation of trifluoroborate-iminiums (TIMs) from potassium acyltrifluoroborates (KATs) and the transformation of TIMs to α-aminotrifluoroborates by reduction or Grignard additions. Conditions for the hydrolysis of α-aminotrifluoroborates to α-aminoboronic acids, which are important biologically active compounds, were established. This new methodology allows access to sterically