The borrowing-hydrogen (or hydrogen autotransfer) process, where the catalyst dehydrogenates a substrate and formally transfers the H atom to an unsaturated intermediate, is an atom-efficient and environmentally benign transformation. Described here is an example of an asymmetric borrowing-hydrogen cascade for the formal anti-Markovnikov hydroamination of allyl alcohols to synthesize optically enriched
Ruthenium-Catalyzed Remote Electronic Activation of Aromatic CF Bonds
作者:Andrew J. A. Watson、Benjamin N. Atkinson、Aoife C. Maxwell、Jonathan M. J. Williams
DOI:10.1002/adsc.201200879
日期:2013.3.11
The tandem isomerization and nucleophilic aromatic substitution of allylic fluoro‐substituted benzylic alcohols is described for the first time. In the presence of the ruthenium complex Ru(PPh3)3(CO)(H)2, 1‐(4‐fluorophenyl)prop‐2‐en‐1‐ol is converted into the corresponding para‐amino ketone or para‐phenolic substituted ketone.
Synthesis of B-ring-fluorinated (−)-epicatechin gallate derivatives
作者:David D. S. Thieltges、Kai D. Baumgarten、Carina S. Michaelis、Constantin Czekelius
DOI:10.1039/d0ob00686f
日期:——
The synthesis of enantiomerically pure B-ring fluorinated catechin derivatives is presented. In a convergent approach the chromane was obtained by reaction of a lithiated fluoro-resorcine with an optically active epoxide. The latter was prepared from 3,4-difluorobenzaldehyde by reaction with vinylmagnesium bromide followed by Sharpless epoxidation. The protocol provides access to both fluorinated catechin