Stereodivergent Alkyne Hydrofluorination Using Protic Tetrafluoroborates as Tunable Reagents
作者:Rui Guo、Xiaotian Qi、Hengye Xiang、Paul Geaneotes、Ruihan Wang、Peng Liu、Yi‐Ming Wang
DOI:10.1002/anie.202006278
日期:2020.9.14
available precursors remains a synthetic challenge. The metal‐free hydrofluorination of alkynes constitutes an attractive though elusive strategy for their preparation. Introduced here is an inexpensive and easily handled reagent that enables the development of simple and scalable protocols for the regioselective hydrofluorination of alkynes to access both the E and Z isomers of vinyl fluorides. These
Regioselective Synthesis of Vinyl Halides, Vinyl Sulfones, and Alkynes: A Tandem Intermolecular Nucleophilic and Electrophilic Vinylation of Tosylhydrazones
作者:Devi Prasan Ojha、Kandikere Ramaiah Prabhu
DOI:10.1021/ol503114n
日期:2015.1.2
in tandem at the carbene center to install an electrophile and a nucleophile on the same carbon. This metal-free concept, which is unprecedented, has been illustrated by regioselectivesynthesis of a variety of vinyl halides, vinyl sulfones, and alkyne derivatives.
Fluorination of olefins with PhSeF3, PhSeF5 and PhTeF5
作者:Sergei A. Lermontov、Sergei I. Zavorin、Ilya V. Bakhtin、Alexei N. Pushin、Nikolai S. Zefirov、Peter J. Stang
DOI:10.1016/s0022-1139(97)00121-8
日期:1998.1
Phenyselenium trifluoride, PhSeF3 (PSTF) either oxidatively difluorinates or selenofluorinates olefins, depending on their structures. The pentafluorides PhSeF5 and PhTeF5 appear to be effective difluorinating reagents, affording 1,2-difluoroalkanes from olefins.
Asymmetric Epoxidation of Fluoroolefins by Chiral Dioxirane. Fluorine Effect on Enantioselectivity
作者:O. Andrea Wong、Yian Shi
DOI:10.1021/jo901553t
日期:2009.11.6
The asymmetricepoxidation of various fluoroolefins has been studied using chiral ketone catalyst, and up to 93% ee was achieved with fructose-derivedketone 1.
已经使用手性酮催化剂研究了各种氟代烯烃的不对称环氧化,果糖衍生的酮1实现了高达 93% 的 ee 。
Geminal difunctionalization of α-diazo arylmethylphosphonates: synthesis of fluorinated phosphonates
作者:Yujing Zhou、Yan Zhang、Jianbo Wang
DOI:10.1039/c6ob01858k
日期:——
A general approach towards diverse fluorinated phosphonates via geminal difunctionalization reactions of α-diazo arylmethylphosphonates is described. The diazo functionality (RR′CN2) is successfully converted to RR′CF2, RR′CHF, RR′CFBr or RR′CFNR′′2 groups by employing different fluorination reagents. A variety of fluorinated organophosphorus compounds were readily accessed in good to excellent yields