Direct Aryloxylation/Alkyloxylation of Dialkyl Phosphonates for the Synthesis of Mixed Phosphonates
作者:Hai Huang、Johanna Denne、Chou‐Hsun Yang、Haobin Wang、Jun Yong Kang
DOI:10.1002/anie.201802082
日期:2018.5.28
A strategy for the direct functionalization strategy of inertial dialkyl phosphonates with hydroxy compounds to afford diverse mixed phosphonates with good yields and functional‐group tolerance has been developed. Mechanistic investigations involving both NMR studies and DFT studies suggest that an unprecedented highly reactive PV species (phosphoryl pyridin‐1‐ium salt), a key intermediate for this
Synthetic uses of thioesters of trifluoromethylated acids. Part 2: Reactions with alkenes
作者:Thierry Billard、Nicolas Roques、Bernard R Langlois
DOI:10.1016/s0040-4039(00)00337-3
日期:2000.4
The photolysis of trifluoromethanethiosulfonates (CF3SO2SR) or trifluorothioacetates (CF3COSR) in the presence of alkenes provides (trifluoromethyl)alkanes or β-sulfanyl (trifluoromethyl)alkanes. The formation of these compounds can be controlled by the nature and the ratio of the reactants.
在烯烃存在下,三氟甲硫基磺酸盐(CF 3 SO 2 SR)或三氟硫代乙酸盐(CF 3 COSR)的光解提供了(三氟甲基)烷烃或β-硫烷基(三氟甲基)烷烃。这些化合物的形成可以通过反应物的性质和比例来控制。
Synthetic Uses of Thio- and Selenoesters of Trifluoromethylated Acids. 1. Preparation of Trifluoromethyl Sulfides and Selenides
作者:Thierry Billard、Nicolas Roques、Bernard R. Langlois
DOI:10.1021/jo980649a
日期:1999.5.1
Trifluorothioacetates (CF3CO-S-R, from (CF3CO)(2)O and thiols) as well as trifluoromethanethio-or trifluoromethaneselenosulfonates (CF3SO2-Y-R; Y = S, Se; from CF3SO2Na, RYYR, and Br-2) can be formally decarbonylated or desulfonylated, respectively, provided that they are photolyzed at 40 degrees C in the presence of 1 equiv of the corresponding disulfide or diselenide. Trifluoromethyl sulfides or selenides are obtained, and the added disulfide (or diselenide) is recovered after reaction. In such a way, S-(trifluoromethyl)cysteine derivatives can be obtained.
A New Route to Thio- and Selenosulfonates from Disulfides and Diselenides. Application to the Synthesis of New Thio- and Selenoesters of Triflic Acid
作者:Thierry Billard、Bernard R. Langlois、Sylvie Large、Daniel Anker、Nathalie Roidot、Philippe Roure
DOI:10.1021/jo960619c
日期:1996.1.1
Alkyl and aryl trifluoromethanethiosulfonates(1) (or selenosulfonates) were prepared in one step either from alkyl and aryl sulfenyl (or selenenyl) chlorides and sodium trifluoromethanesulfinate (3) or, more generally, from disulfides (or diselenides), 3, and bromine. The second method involved trifluoromethanesulfonyl bromide as key intermediate. Benzenethiosulfonates were obtained in a similar way from disulfides, benzenesulfinate, and bromine but benzeneselenosulfonates could not be obtained by the same method from diselenides.
Addition of trifluoromethanethio- and trifluoromethaneseleno-sulfonates to olefins. Synthesis of vinyl triflones
作者:Thierry Billard、Bernard R Langlois
DOI:10.1016/s0040-4020(99)00421-4
日期:1999.6
trifluoromethaneselenosulfonates are strong electrophilic reagents which add rapidly to olefins to deliver β-sulfenyl and β-selenyl triflones. These products are converted in high yields to vinyl triflones by different techniques under mild conditions. This two-step procedure is an efficient route to vinyl triflones from non-functionalized olefins.