Chemistry of novel compounds with multifunctional carbon structure. VI. Synthetic studies and 19F-nuclear magnetic resonance investigation of novel .ALPHA.,.ALPHA.-disubstituted fluoroacetates.
Nickel-Catalyzed Heck-Type Monofluoroacetation of Styrenes for Facile Synthesis of Allylic Fluorides
作者:Zhen-Yu Wang、Jia-Hao Wan、Gao-Yin Wang、Ruo-Xing Jin、Quan Lan、Xi-Sheng Wang
DOI:10.1002/asia.201701655
日期:2018.2.2
An efficient nickel‐catalyzed Heck‐type reaction between styrenes and fluoroalkyl iodine has been developed. This novel transformation has demonstrated a broad substrate scope, mild reaction conditions and excellent E‐stereoselectivity. This efficient synthetic method has been applied to the late‐stage monofluoroacetation of biologically active molecules. Mechanistic investigations indicate that a
Synthesis of optically active β-keto-γ-butyrolactones having a trifluoromethyl group
作者:Tomoya Kitazume
DOI:10.1016/s0022-1139(00)85012-5
日期:1987.3
A number of chiral β-keto-γ-butyrolactones and tetronic acids bearing a trifluoromethyl group on an asymmetric carbon were prepared by ultrasound-promoted Reformatsky-type reactions between an optically active O-trimethylsilylated cyanohydrin of trifluoroacetaldehyde and ethyl α-substituted bromoacetates.
Synthesis of 3-Substituted 2-Fluoro- and 2,2-Difluoroaziridines
作者:Eva Van Hende、Guido Verniest、Riccardo Surmont、Norbert De Kimpe
DOI:10.1021/ol071127x
日期:2007.7.1
A new route for the synthesis of stable 3-alkyl- and 3-aryl-2(,2)-(di)fluoroaziridines was developed by hydride reduction of novel alpha-bromo- and alpha-chloro-alpha(,alpha)-(di)fluoroketimines and subsequent ring closure of beta-fluorinated beta-chloro- and beta-bromoamines. This is the first report on the synthesis of 2,2-difluoroaziridines sensu stricto.
According to the present invention, there is provided a production process of a 2-fluoroacrylic ester including: a bromination step of converting a 2-fluoropropionic ester to a 2-bromo-2-fluoropropionic ester by reaction of the 2-fluoropropionic ester with a nitrogen-bromine bond-containing brominating agent in the presence of a radical initiator; and a dehydrobromination step of reacting the 2-bromo-2-fluoropropionic ester with a base. It is not necessary in this process to adopt very-low-temperature conditions and to use a stoichiometric amount of expensive reagent. The target 2-fluoroacrylic ester can be thus produced at low cost.