Regioselective Gold-Catalyzed Hydration of CF3- and SF5-alkynes
摘要:
The regioselective gold-catalyzed hydration of CF3- and SF5-alkynes is described. The corresponding trifluoromethylated and pentasulfanylated ketones are obtained in up to 91% yield as single regioisomers showcasing the use of CF3 and SF5 as highly efficient directing groups in this reaction. Notably, this transformation represents the first use of CF3- and SF5-alkynes in gold catalysis.
Use of 1-pentafluorosulfanyl-phenylacetylenes for the preparation of SF5-substituted five-membered ring heterocycles through 1,3-dipolar cycloadditions. Isoxazoles and isoxazolines
作者:Simon E. Lopez、Akira Mitani、Priscila Pena、Ion Ghiviriga、William R. Dolbier
DOI:10.1016/j.jfluchem.2015.06.006
日期:2015.8
synthetic methodology utilizing 1,3-dipolarcycloadditions was developed for the preparation of pentafluorosulfanyl-substituted heterocycles using SF5-substituted arylacetylenes as key building block dipolarophiles. A group of 4-SF5-isoxazoles were prepared in moderate yields using in situ generated nitrileoxides, and 4-SF5-substituted isoxazolines were obtained when nitrones were used as the 1,3-dipole
PREPARATION OF PENTAFLUOROSULFANYL (SF5) HETEROCYCLES: PYRROLES AND THIOPHENES
申请人:Zheng Zhaoyun
公开号:US20110040103A1
公开(公告)日:2011-02-17
The subject invention pertains to pentafluorosulfonyl (SF5) substituted pyrroles, thiophenes, 3-pyrrolines and 2,5-dihydrothiophenes, as well as methods for their synthesis.
本发明涉及五氟磺酰(SF5)取代的吡咯、噻吩、3-吡咯烷和2,5-二氢噻吩,以及它们的合成方法。
Preparation of Pentafluorosulfanyl (SF<sub>5</sub>) Pyrrole Carboxylic Acid Esters
作者:William R. Dolbier、Zhaoyun Zheng
DOI:10.1021/jo9007699
日期:2009.8.7
paper, a facile preparation of SF5-substituted pyrrole carboxylic acid esters in good yield is reported. Utilizing the cycloaddition of an azomethine ylide to pentafluorosulfanylalkynes, a series of dihydropyrroles were prepared and oxidized to the respective 1-tert-butyl-4-(pentafluorosulfanyl)pyrrole-2-carboxylic acid esters in good yield. Further treatment of these pyrroles with catalytic triflic
Use of 1,3-dipolar reactions for the preparation of SF5-substituted five-membered ring heterocycles. Pyrroles and thiophenes
作者:William R. Dolbier、Zhaoyun Zheng
DOI:10.1016/j.jfluchem.2011.03.017
日期:2011.6
4-pentafluorosulfanylthiophenes, the latter of which are to our knowledge the first reported SF5-substituted thiophenes. The 1,3-cycloadditions of these ylides with aryl and alkyl, SF5-alkynes produce dihydro-pyrroles and thiophenes, which without isolation can then be oxidatively aromatized to the respective pentafluorosulfanylpyrroles and thiophenes in good yield.
Pentafluoro-λ6-sulfanylacetylene complexes of cobalt
作者:Thomas Henkel、Axel Klauck、Konrad Seppelt
DOI:10.1016/0022-328x(94)05271-c
日期:1995.10
The reaction of Co2(CO)8 with RCCSF5 gives 1 : 1, 1 : 2, and 1 : 3 type products, depending on R. For R = H all three products can be isolated. According to the single-crystal structure determinations, the 1 : 1 product has the known di-cobaltatetrahedrane structure, the 1 : 2 product is a cobaltacyclopentadienecobalt, whereas the 1 : 3 product has been previously identified as a “fly-over bridge”
CO 2(CO)的反应8与RCCSF 5给出了1:1,1:2和1:3级型的产品,这取决于R.对于R = H所有三种产品可被分离。根据单晶结构测定,1:1产物具有已知的二钴四面体结构,1:2产物为钴环戊二烯钴,而1:3产物先前已被鉴定为“飞越桥”复杂的。位更拥挤˚F 3 CCCSF 5和C 6 H ^ 5 CCSF 5只给出1:1反应。F的产物3 CCCSF 5分发生反应进一步用HCCSF 5 制成由不同炔烃分子组成的1:3产物。