Synthesis of secondary and tertiary amides without coupling agents from amines and potassium acyltrifluoroborates (KATs)
作者:Anne Schuhmacher、Tomoya Shiro、Sarah J. Ryan、Jeffrey W. Bode
DOI:10.1039/d0sc01330g
日期:——
Although highly effective for most amide syntheses, the activation of carboxylicacids requires the use of problematic coupling reagents and is often poorly suited for challenging cases such as N-methyl amino acids. As an alternative to both secondary and tertiary amides, we report their convenient synthesis by the rapid oxidation of trifluoroborate iminiums (TIMs). TIMs are easily prepared by acid-promoted
(photo-DAFEx) as a novel type of photo-click reaction that is mediated through acyl fluorides produced by the photo-defluorination of m-trifluoromethylaniline to covalently conjugate with primary/secondary amines and thiols in an aqueousenvironment. (TD)-DFT calculations, together with experimental discovery, indicate that the m-NH2PhF2C(sp3)–F bond in the excited triplet state is cleaved by water molecules
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