Rh-Catalyzed Carboxylates Directed C-H Activation for the Synthesis of <i>ortho</i>
-Carboxylic 2-Arylethenesulfonyl Fluorides: Access to Unique Electrophiles for SuFEx Click Chemistry
A carboxylic ester directed monoselective coupling of sp2 C–H bonds with ethenesulfonyl fluoride (ESF) was achieved by using a RhIII catalyst. This protocol gives access to a class of ortho‐carboxylic‐functionalized 2‐arylethenesulfonyl fluorides. The versatile and unique properties of carboxylic groups will significantly improve the capability of using 2‐arylethenesulfonyl fluorides as covalent probes
Selective Acylation of Aryl- and Heteroarylmagnesium Reagents with Esters in Continuous Flow
作者:Benjamin Heinz、Dimitrije Djukanovic、Maximilian A. Ganiek、Benjamin Martin、Berthold Schenkel、Paul Knochel
DOI:10.1021/acs.orglett.9b04254
日期:2020.1.17
A selectiveacylation of readily accessible organomagnesium reagents with commercially available esters proceeds at convenient temperatures and short residence times in continuous flow. Flow conditions allow us to prevent premature collapse of the hemiacetal intermediates despite noncryogenic conditions, thus furnishing ketones in good yields. Throughout, the coordinating ability of the ester and/or
Chiral Phosphoric-Acid-Catalyzed Regioselective and Enantioselective C7-Friedel–Crafts Alkylation of 4-Aminoindoles with Trifluoromethyl Ketones
作者:Lu Cai、Yunlong Zhao、Tongkun Huang、Shanshui Meng、Xian Jia、Albert S. C. Chan、Junling Zhao
DOI:10.1021/acs.orglett.9b00821
日期:2019.5.17
trifluoromethyl ketones promoted by a spirocyclic phosphoric acid was developed. This strategy was applicable to various substituted trifluoromethyl ketones and 4-aminoindole derivatives, affording the corresponding C7-functionalized indole derivatives, bearing a pharmaceutically interesting trifluoromethylated tertiary alcohol scaffold, in 21%–98% yields with up to >99% enantiomeric excess (ee).
Efficient Access to Multifunctional Trifluoromethyl Alcohols through Base-Free Catalytic Asymmetric C−C Bond Formation with Terminal Ynamides
作者:Andrea M. Cook、Christian Wolf
DOI:10.1002/anie.201510910
日期:2016.2.18
The asymmetric addition of terminal ynamides to trifluoromethyl ketones with a readily available chiral zinc catalyst gives CF3‐substituted tertiary propargylic alcohols in up to 99 % yield and 96 % ee. The exclusion of organozinc additives and base as well as the general synthetic utility of the products are key features of this reaction. The value of the β‐hydroxy‐β‐trifluoromethyl ynamides is exemplified
Synthesis of chiral tertiary trifluoromethyl alcohols by asymmetric nitroaldol reaction with a Cu(ii)-bisoxazolidine catalyst
作者:Hanhui Xu、Christian Wolf
DOI:10.1039/c0cc02378g
日期:——
A highly enantioselective and diastereoselectivecopper(II)-bisoxazolidine catalyzednitroaldolreaction with aliphatic and aromatic trifluoromethyl ketones is described.